diff --git a/.github/workflows/check-jsonschema.yml b/.github/workflows/check-jsonschema.yml
new file mode 100644
index 0000000..4c1cb75
--- /dev/null
+++ b/.github/workflows/check-jsonschema.yml
@@ -0,0 +1,35 @@
+name: Check JSON Schema $ref integrity
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    # Optional: only run when schemas or the script change
+    paths:
+      - "schema/**"
+      - ".github/workflows/check-jsonschema.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  check-refs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: "pip"
+
+      # If you already have a requirements file, replace this step with pip install -r ...
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt
+
+      - name: Run $ref checker
+        run: |
+          python schema/v4/check_refs.py
\ No newline at end of file
diff --git a/schema/v4/AccompanyingCanvas.json b/schema/v4/AccompanyingCanvas.json
new file mode 100644
index 0000000..0429bc8
--- /dev/null
+++ b/schema/v4/AccompanyingCanvas.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AccompanyingCanvas.json",
+    "title":"AccompanyingCanvas",
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "Canvas.json"
+        },
+        {
+            "type": "object",
+            "not": {
+                "required": [
+                    "placeholderCanvas",
+                    "accompanyingCanvas"
+                ]
+            }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/AnnoTarget.json b/schema/v4/AnnoTarget.json
new file mode 100644
index 0000000..3f132b0
--- /dev/null
+++ b/schema/v4/AnnoTarget.json
@@ -0,0 +1,17 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnoTarget.json",
+    "title": "AnnotationTarget",
+    "if": {
+        "type": "string"
+    },
+    "then": {
+        "type": "string",
+        "format": "uri",
+        "pattern": "^http.*$"
+    },
+    "else": {
+        "type": "object",
+        "$ref": "SpecificResource.json"
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/Annotation.json b/schema/v4/Annotation.json
new file mode 100644
index 0000000..b7bab63
--- /dev/null
+++ b/schema/v4/Annotation.json
@@ -0,0 +1,151 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Annotation.json",
+    "type": "object",
+    "title": "Annotation",
+    "properties": {
+        "@context": {
+            "$ref": "Context.json"
+        },
+        "created": {
+            "type": "string"
+        },
+        "modified": {
+            "type": "string"
+        },
+        "generated": {
+            "type": "string"
+        },
+        "creator": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "$ref": "Agent.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "oneOf": [
+                            {
+                                "type": "string"
+                            },
+                            {
+                                "$ref": "Agent.json"
+                            }
+                        ]
+                    }
+                }
+            ]
+        },
+        "generator": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "$ref": "Agent.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "oneOf": [
+                            {
+                                "type": "string"
+                            },
+                            {
+                                "$ref": "Agent.json"
+                            }
+                        ]
+                    }
+                }
+            ]
+        },
+        "audience": {
+            "oneOf": [
+                {
+                    "$ref": "Audiance.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "$ref": "Audiance.json"
+                    }
+                }
+            ]
+        },
+        "bodyValue": {
+            "type": "string"
+        },
+        "canonical": {
+            "type": "string",
+            "format": "uri"
+        },
+        "via": {
+            "oneOf": [
+                {
+                    "type": "string",
+                    "format": "uri"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "type": "string",
+                        "format": "uri"
+                    }
+                }
+            ]
+        },
+        "stylesheet": {
+            "$ref": "Stylesheet.json"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^Annotation$",
+            "default": "Annotation"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "motivation": {
+            "type": "array",
+            "items": {
+                "type": "string"
+            }
+        },
+        "body": {
+            "type": "array",
+            "items": {
+                "anyOf": [
+                    {
+                        "$ref": "Resource.json"
+                    },
+                    {
+                        "$ref": "Choice.json"
+                    }
+                ]
+            }
+        },
+        "target": {
+            "type": "array",
+            "items": {
+                "$ref": "AnnoTarget.json"
+            }
+        }
+    },
+    "required": [
+        "id",
+        "target",
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/AnnotationBody.json b/schema/v4/AnnotationBody.json
new file mode 100644
index 0000000..21a0cb9
--- /dev/null
+++ b/schema/v4/AnnotationBody.json
@@ -0,0 +1,69 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnotationBody.json",
+    "type": "object",
+    "title": "AnnotationBody",
+    "description": "Annotation bodies MUST have an id and type property.",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "not": {
+                "enum": [
+                    "TextualBody",
+                    "SpecificResource",
+                    "Choice"
+                ]
+            }
+        },
+        "height": {
+            "$ref": "properties.json#/$defs/dimension"
+        },
+        "width": {
+            "$ref": "properties.json#/$defs/dimension"
+        },
+        "duration": {
+            "$ref": "properties.json#/$defs/duration"
+        },
+        "language": {
+            "type": "string"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "format": {
+            "$ref": "properties.json#/$defs/format"
+        },
+        "label": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "annotations": {
+            "type": "array",
+            "items": {
+                "oneOf": [
+                    {
+                        "$ref": "AnnotationPage.json"
+                    },
+                    {
+                        "$ref": "AnnotationPageRef.json"
+                    }
+                ]
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/AnnotationCollection.json b/schema/v4/AnnotationCollection.json
new file mode 100644
index 0000000..636a2e5
--- /dev/null
+++ b/schema/v4/AnnotationCollection.json
@@ -0,0 +1,58 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnotationCollection.json",
+    "title": "AnnotationCollection",
+    "type": "object",
+    "properties": {
+        "@context": {
+            "$ref": "Context.json"
+        },
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^AnnotationCollection$",
+            "default": "AnnotationCollection"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "partOf": {
+            "$ref": "PartOf.json"
+        },
+        "next": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "first": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "last": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "total": {
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "$ref": "Annotation.json"
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type",
+        "items"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/AnnotationCollectionRef.json b/schema/v4/AnnotationCollectionRef.json
new file mode 100644
index 0000000..53cc69f
--- /dev/null
+++ b/schema/v4/AnnotationCollectionRef.json
@@ -0,0 +1,30 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnotationCollectionRef.json",
+    "title": "AnnotationCollectionRef",
+    "if": {
+        "type": "string"
+    },
+    "then": {
+        "type": "string",
+        "format": "uri",
+        "pattern": "^http.*$"
+    },
+    "else": {
+        "title": "AnnotationCollectionRefExtended",
+        "allOf": [
+            {
+                "$ref": "Reference.json"
+            },
+            {
+                "type": "object",
+                "properties": {
+                    "type": {
+                        "type": "string",
+                        "pattern": "^AnnotationCollection$"
+                    }
+                }
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/AnnotationPage.json b/schema/v4/AnnotationPage.json
new file mode 100644
index 0000000..c51eb5e
--- /dev/null
+++ b/schema/v4/AnnotationPage.json
@@ -0,0 +1,61 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnotationPage.json",
+    "type": "object",
+    "title": "AnnotationPage",
+    "description": "id, type and items required",
+    "properties": {
+        "@context": {
+            "$ref": "Context.json"
+        },
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^AnnotationPage$",
+            "default": "AnnotationPage"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "label": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "$ref": "Annotation.json"
+            }
+        },
+        "partOf": {
+            "$ref": "PartOf.json"
+        },
+        "next": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "prev": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "first": {
+            "$ref": "AnnotationPageRef.json"
+        },
+        "last": {
+            "$ref": "AnnotationPageRef.json"
+        }
+    },
+    "required": [
+        "id",
+        "type",
+        "items"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/AnnotationPageRef.json b/schema/v4/AnnotationPageRef.json
new file mode 100644
index 0000000..4ec68bc
--- /dev/null
+++ b/schema/v4/AnnotationPageRef.json
@@ -0,0 +1,28 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/AnnotationPageRef.json",
+    "title": "AnnotationPageRef",
+    "if": {
+        "type": "string"
+    },
+    "then": {
+        "type": "string"
+    },
+    "else": {
+        "title": "AnnotationPageRefExtended",
+        "allOf": [
+            {
+                "$ref": "Reference.json"
+            },
+            {
+                "type": "object",
+                "properties": {
+                    "type": {
+                        "type": "string",
+                        "pattern": "^AnnotationPage$"
+                    }
+                }
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/Canvas.json b/schema/v4/Canvas.json
new file mode 100644
index 0000000..e7ce22b
--- /dev/null
+++ b/schema/v4/Canvas.json
@@ -0,0 +1,40 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Canvas.json",
+    "title": "Canvas",
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "Container.json"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "type": {
+                    "type": "string",
+                    "pattern": "^Canvas$",
+                    "default": "Canvas"
+                },
+                "height": {
+                    "$ref": "properties.json#/$defs/dimension"
+                },
+                "width": {
+                    "$ref": "properties.json#/$defs/dimension"
+                },
+                "duration": {
+                    "$ref": "properties.json#/$defs/duration"
+                },
+                "spatialScale": {
+                    "$ref": "Quantity.json"
+                }
+            },
+            "required": [
+                "id",
+                "type",
+                "items",
+                "height",
+                "width"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Choice.json b/schema/v4/Choice.json
new file mode 100644
index 0000000..ed6f6a4
--- /dev/null
+++ b/schema/v4/Choice.json
@@ -0,0 +1,23 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Choice.json",
+    "title": "Choice",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "const": "Choice",
+            "default": "Choice"
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        }
+    },
+    "required": [
+        "type",
+        "items"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Collection.json b/schema/v4/Collection.json
new file mode 100644
index 0000000..f1fa2cd
--- /dev/null
+++ b/schema/v4/Collection.json
@@ -0,0 +1,107 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Collection.json",
+    "title": "Collection",
+    "type": "object",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^Collection",
+            "default": "Collection",
+            "title": "Collection",
+            "description": "If you are validating a manifest, you may get this error if there are errors in the manifest. The validator first validates it as a manifest and if that fails it will try and validate it using the other types."
+        },
+        "metadata": {
+            "$ref": "Metadata.json"
+        },
+        "summary": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "requiredStatement": {
+            "$ref": "properties.json#/$defs/keyValueString"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "rights": {
+            "$ref": "properties.json#/$defs/rights"
+        },
+        "navDate": {
+            "$ref": "properties.json#/$defs/navDate"
+        },
+        "navPlace": {
+            "$ref": "NavPlace.json"
+        },
+        "provider": {
+            "$ref": "Provider.json"
+        },
+        "seeAlso": {
+            "$ref": "SeeAlso.json"
+        },
+        "services": {
+            "$ref": "Service.json"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "placeholderCanvas": {
+            "$ref": "PlaceholderCanvas.json"
+        },
+        "accompanyingCanvas": {
+            "$ref": "AccompanyingCanvas.json"
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "homepage": {
+            "$ref": "Homepage.json"
+        },
+        "behavior": {
+            "$ref": "properties.json#/$defs/behavior"
+        },
+        "partOf": {
+            "$ref": "PartOf.json"
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "anyOf": [
+                    {
+                        "$ref": "ManifestRef.json"
+                    },
+                    {
+                        "$ref": "CollectionRef.json"
+                    },
+                    {
+                        "$ref": "Collection.json"
+                    }
+                ]
+            }
+        },
+        "annotations": {
+            "type": "array",
+            "items": {
+                "oneOf": [
+                    {
+                        "$ref": "AnnotationPage.json"
+                    },
+                    {
+                        "$ref": "AnnotationPageRef.json"
+                    }
+                ]
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type",
+        "label",
+        "items"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/CollectionRef.json b/schema/v4/CollectionRef.json
new file mode 100644
index 0000000..4271cd7
--- /dev/null
+++ b/schema/v4/CollectionRef.json
@@ -0,0 +1,25 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/CollectionRef.json",
+    "title": "CollectionRef",
+    "allOf": [
+        {
+            "$ref": "Reference.json"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "type": {
+                    "type": "string",
+                    "pattern": "^Collection$"
+                },
+                "label": {
+                    "$ref": "properties.json#/$defs/lngString"
+                }
+            },
+            "required": [
+                "label"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Container.json b/schema/v4/Container.json
new file mode 100644
index 0000000..b340f7b
--- /dev/null
+++ b/schema/v4/Container.json
@@ -0,0 +1,93 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Container.json",
+    "title": "Container",
+    "type": "object",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "enum": [
+                "Canvas",
+                "Timeline",
+                "Scene"
+            ]
+        },
+        "metadata": {
+            "$ref": "Metadata.json"
+        },
+        "summary": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "requiredStatement": {
+            "$ref": "properties.json#/$defs/keyValueString"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "rights": {
+            "$ref": "properties.json#/$defs/rights"
+        },
+        "navDate": {
+            "$ref": "properties.json#/$defs/navDate"
+        },
+        "navPlace": {
+            "$ref": "NavPlace.json"
+        },
+        "provider": {
+            "$ref": "Provider.json"
+        },
+        "seeAlso": {
+            "$ref": "SeeAlso.json"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "placeholderCanvas": {
+            "$ref": "PlaceholderCanvas.json"
+        },
+        "accompanyingCanvas": {
+            "$ref": "AccompanyingCanvas.json"
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        },
+        "homepage": {
+            "$ref": "Homepage.json"
+        },
+        "behavior": {
+            "$ref": "properties.json#/$defs/behavior"
+        },
+        "partOf": {
+            "$ref": "PartOf.json"
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "$ref": "AnnotationPage.json"
+            }
+        },
+        "annotations": {
+            "type": "array",
+            "items": {
+                "oneOf": [
+                    {
+                        "$ref": "AnnotationPage.json"
+                    },
+                    {
+                        "$ref": "AnnotationPageRef.json"
+                    }
+                ]
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Context.json b/schema/v4/Context.json
new file mode 100644
index 0000000..f60a130
--- /dev/null
+++ b/schema/v4/Context.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Context.json",
+    "title": "Context",
+    "if": {
+        "type": "array"
+    },
+    "then": {
+        "$comment": "Array form of @context, with at least one entry that is the IIIF context. The IIIF context MUST be the last item but we can't test that with JSON Schema",
+        "type": "array",
+        "items": {
+            "type": "string",
+            "format": "uri",
+            "pattern": "^http.*$"
+        },
+        "minItems": 1,
+        "contains": {
+            "$ref": "properties.json#/$defs/context"
+        },
+        "minContains": 1,
+        "maxContains": 1
+    },
+    "else": {
+        "$ref": "properties.json#/$defs/context"
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/CssSelector.json b/schema/v4/CssSelector.json
new file mode 100644
index 0000000..4c52f48
--- /dev/null
+++ b/schema/v4/CssSelector.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/CssSelector.json",
+    "title": "CssSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^CssSelector$",
+            "default": "CssSelector"
+        },
+        "value": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "type",
+        "value"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/DataPositionSelector.json b/schema/v4/DataPositionSelector.json
new file mode 100644
index 0000000..4af6160
--- /dev/null
+++ b/schema/v4/DataPositionSelector.json
@@ -0,0 +1,24 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/DataPositionSelector.json",
+    "title": "DataPositionSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^DataPositionSelector$",
+            "default": "DataPositionSelector"
+        },
+        "start": {
+            "type": "integer"
+        },
+        "end": {
+            "type": "integer"
+        }
+    },
+    "required": [
+        "type",
+        "start",
+        "end"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/FragmentSelector.json b/schema/v4/FragmentSelector.json
new file mode 100644
index 0000000..33428ff
--- /dev/null
+++ b/schema/v4/FragmentSelector.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/FragmentSelector.json",
+    "title": "FragmentSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^FragmentSelector$",
+            "default": "FragmentSelector"
+        },
+        "conformsTo": {
+            "type": "string",
+            "format": "uri",
+            "pattern": "^http.*$",
+            "default": "http://www.w3.org/TR/media-frags/"
+        },
+        "value": {
+            "type:": "string"
+        }
+    },
+    "required": [
+        "type",
+        "value"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Homepage.json b/schema/v4/Homepage.json
new file mode 100644
index 0000000..e1efd5b
--- /dev/null
+++ b/schema/v4/Homepage.json
@@ -0,0 +1,37 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Homepage.json",
+    "title": "homepages",
+    "type": "array",
+    "items": {
+        "title": "homepage",
+        "type": "object",
+        "properties": {
+            "id": {
+                "$ref": "properties.json#/$defs/id"
+            },
+            "type": {
+                "type": "string",
+                "pattern": "^Text$",
+                "default": "Text"
+            },
+            "label": {
+                "$ref": "properties.json#/$defs/lngString"
+            },
+            "format": {
+                "$ref": "properties.json#/$defs/format"
+            },
+            "language": {
+                "type": "array",
+                "items": {
+                    "$ref": "properties.json#/$defs/BCP47"
+                }
+            }
+        },
+        "required": [
+            "id",
+            "type",
+            "label"
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/HttpRequestState.json b/schema/v4/HttpRequestState.json
new file mode 100644
index 0000000..d916d23
--- /dev/null
+++ b/schema/v4/HttpRequestState.json
@@ -0,0 +1,21 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/HttpRequestState.json",
+    "title": "HttpRequestState",
+    "description": "W3C Web Annotation HttpRequestState for HTTP header requirements",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^HttpRequestState$",
+            "default": "HttpRequestState"
+        },
+        "value": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "type",
+        "value"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/ImageAPISelector.json b/schema/v4/ImageAPISelector.json
new file mode 100644
index 0000000..c571536
--- /dev/null
+++ b/schema/v4/ImageAPISelector.json
@@ -0,0 +1,31 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/ImageAPISelector.json",
+    "title": "ImageAPISelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^ImageApiSelector$",
+            "default": "ImageApiSelector"
+        },
+        "region": {
+            "type:": "string"
+        },
+        "size": {
+            "type:": "string"
+        },
+        "rotation": {
+            "type:": "string"
+        },
+        "quality": {
+            "type:": "string"
+        },
+        "format": {
+            "type:": "string"
+        }
+    },
+    "required": [
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Manifest.json b/schema/v4/Manifest.json
new file mode 100644
index 0000000..f02502e
--- /dev/null
+++ b/schema/v4/Manifest.json
@@ -0,0 +1,92 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Manifest.json",
+    "title": "Manifest",
+    "type": "object",
+    "properties": {
+        "@context": {
+            "$ref": "Context.json"
+        },
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^Manifest$",
+            "default": "Manifest"
+        },
+        "label": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "metadata": {
+            "$ref": "Metadata.json"
+        },
+        "summary": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "requiredStatement": {
+            "$ref": "properties.json#/$defs/keyValueString"
+        },
+        "rendering": {
+            "$ref": "External.json"
+        },
+        "service": {
+            "$ref": "Service.json"
+        },
+        "services": {
+            "$ref": "Service.json"
+        },
+        "viewingDirection": {
+            "$ref": "properties.json#/$defs/viewingDirection"
+        },
+        "items": {
+            "type": "array",
+            "items": {
+                "type": "object",
+                "required": [
+                    "type"
+                ],
+                "if": {
+                    "properties": {
+                        "type": {
+                            "const": "Canvas"
+                        }
+                    }
+                },
+                "then": {
+                    "$ref": "Canvas.json"
+                },
+                "else": {
+                    "if": {
+                        "properties": {
+                            "type": {
+                                "const": "Timeline"
+                            }
+                        }
+                    },
+                    "then": {
+                        "$ref": "Timeline.json"
+                    },
+                    "else": {
+                        "if": {
+                            "properties": {
+                                "type": {
+                                    "const": "Scene"
+                                }
+                            }
+                        },
+                        "then": {
+                            "$ref": "Scene.json"
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type",
+        "label",
+        "items"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/ManifestRef.json b/schema/v4/ManifestRef.json
new file mode 100644
index 0000000..23260b6
--- /dev/null
+++ b/schema/v4/ManifestRef.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/ManifestRef.json",
+    "title": "ManifestRef",
+    "allOf": [
+        {
+            "$ref": "Reference.json"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "type": {
+                    "type": "string",
+                    "pattern": "^Manifest$",
+                    "default": "Manifest"
+                },
+                "label": {
+                    "$ref": "properties.json#/$defs/lngString"
+                }
+            },
+            "required": [
+                "label"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/NavPlace.json b/schema/v4/NavPlace.json
new file mode 100644
index 0000000..a1b9ece
--- /dev/null
+++ b/schema/v4/NavPlace.json
@@ -0,0 +1,25 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/NavPlace.json",
+    "title": "NavPlace",
+    "type": "object",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "default": "FeatureCollection"
+        },
+        "features": {
+            "type": "array",
+            "items": {
+                "type": "object"
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/PartOf.json b/schema/v4/PartOf.json
new file mode 100644
index 0000000..fb8e275
--- /dev/null
+++ b/schema/v4/PartOf.json
@@ -0,0 +1,31 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/PartOf.json",
+    "title": "PartOf",
+    "type": "array",
+    "items": {
+        "type": "object",
+        "properties": {
+            "id": {
+                "$ref": "properties.json#/$defs/id"
+            },
+            "type": {
+                "type": "string",
+                "enum": [
+                    "AnnotationCollection",
+                    "Collection",
+                    "Manifest"
+                ]
+            }
+        },
+        "required": [
+            "id",
+            "type"
+        ],
+        "not": {
+            "required": [
+                "items"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/PlaceholderCanvas.json b/schema/v4/PlaceholderCanvas.json
new file mode 100644
index 0000000..1194b47
--- /dev/null
+++ b/schema/v4/PlaceholderCanvas.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/PlaceholderCanvas.json",
+    "title": "PlaceholderCanvas",
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "Canvas.json"
+        },
+        {
+            "type": "object",
+            "not": {
+                "required": [
+                    "placeholderCanvas",
+                    "accompanyingCanvas"
+                ]
+            }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/PointSelector.json b/schema/v4/PointSelector.json
new file mode 100644
index 0000000..8214437
--- /dev/null
+++ b/schema/v4/PointSelector.json
@@ -0,0 +1,25 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/PointSelector.json",
+    "title": "PointSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^PointSelector$",
+            "default": "PointSelector"
+        },
+        "t": {
+            "$ref": "properties.json#/$defs/duration"
+        },
+        "x": {
+            "$ref": "properties.json#/$defs/dimension"
+        },
+        "y": {
+            "$ref": "properties.json#/$defs/dimension"
+        }
+    },
+    "required": [
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Provider.json b/schema/v4/Provider.json
new file mode 100644
index 0000000..f27a98e
--- /dev/null
+++ b/schema/v4/Provider.json
@@ -0,0 +1,37 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Provider.json",
+    "title": "providers",
+    "type": "array",
+    "items": {
+        "allOf": [
+            {
+                "$ref": "Agent.json"
+            },
+            {
+                "title": "provider",
+                "type": "object",
+                "properties": {
+                    "label": {
+                        "$ref": "properties.json#/$defs/lngString"
+                    },
+                    "homepage": {
+                        "$ref": "Homepage.json"
+                    },
+                    "logo": {
+                        "type": "array",
+                        "items": {
+                            "$ref": "Resource.json"
+                        }
+                    },
+                    "seeAlso": {
+                        "$ref": "SeeAlso.json"
+                    }
+                },
+                "required": [
+                    "label"
+                ]
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/Quantity.json b/schema/v4/Quantity.json
new file mode 100644
index 0000000..81fb8a7
--- /dev/null
+++ b/schema/v4/Quantity.json
@@ -0,0 +1,19 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Quantity.json",
+    "title": "Quantity",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^Scene$",
+            "default": "Scene"
+        },
+        "quantityValue": {
+            "type": "number"
+        },
+        "unit": {
+            "type": "string"
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/RangeSelector.json b/schema/v4/RangeSelector.json
new file mode 100644
index 0000000..d1dda33
--- /dev/null
+++ b/schema/v4/RangeSelector.json
@@ -0,0 +1,27 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/RangeSelector.json",
+    "title": "RangeSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^RangeSelector$",
+            "default": "RangeSelector"
+        },
+        "startSelector": {
+            "$ref": "Selector.json"
+        },
+        "endSelector": {
+            "$ref": "Selector.json"
+        },
+        "refinedBy": {
+            "$ref": "Selector.json"
+        }
+    },
+    "required": [
+        "type",
+        "startSelector",
+        "endSelector"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Resource.json b/schema/v4/Resource.json
new file mode 100644
index 0000000..ac47db1
--- /dev/null
+++ b/schema/v4/Resource.json
@@ -0,0 +1,51 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Resource.json",
+    "type": "object",
+    "if": {
+        "properties": {
+            "type": {
+                "const": "TextualBody"
+            }
+        },
+        "required": [
+            "type"
+        ]
+    },
+    "then": {
+        "$ref": "TextualBody.json"
+    },
+    "else": {
+        "if": {
+            "properties": {
+                "type": {
+                    "const": "SpecificResource"
+                }
+            },
+            "required": [
+                "type"
+            ]
+        },
+        "then": {
+            "$ref": "SpecificResource.json"
+        },
+        "else": {
+            "if": {
+                "properties": {
+                    "type": {
+                        "const": "Choice"
+                    }
+                },
+                "required": [
+                    "type"
+                ]
+            },
+            "then": {
+                "$ref": "Choice.json"
+            },
+            "else": {
+                "$ref": "AnnotationBody.json"
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/SVGSelector.json b/schema/v4/SVGSelector.json
new file mode 100644
index 0000000..83eb7ed
--- /dev/null
+++ b/schema/v4/SVGSelector.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/SVGSelector.json",
+    "title": "SVGSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^SvgSelector$",
+            "default": "SvgSelector"
+        },
+        "value": {
+            "type:": "string"
+        }
+    },
+    "required": [
+        "type",
+        "value"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Scene.json b/schema/v4/Scene.json
new file mode 100644
index 0000000..6acb030
--- /dev/null
+++ b/schema/v4/Scene.json
@@ -0,0 +1,32 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Scene.json",
+    "title": "Scene",
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "Container.json"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "type": {
+                    "type": "string",
+                    "pattern": "^Scene$",
+                    "default": "Scene"
+                },
+                "duration": {
+                    "$ref": "properties.json#/$defs/duration"
+                },
+                "spatialScale": {
+                    "$ref": "Quantity.json"
+                }
+            },
+            "required": [
+                "id",
+                "type",
+                "items"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/SeeAlso.json b/schema/v4/SeeAlso.json
new file mode 100644
index 0000000..804ed17
--- /dev/null
+++ b/schema/v4/SeeAlso.json
@@ -0,0 +1,5 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/SeeAlso.json",
+    "$ref": "External.json"
+}
\ No newline at end of file
diff --git a/schema/v4/Selector.json b/schema/v4/Selector.json
new file mode 100644
index 0000000..b1ee5f2
--- /dev/null
+++ b/schema/v4/Selector.json
@@ -0,0 +1,137 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Selector.json",
+    "title": "Selector",
+    "if": {
+        "type": "string"
+    },
+    "then": {
+        "type": "string",
+        "format": "uri",
+        "pattern": "^http.*$"
+    },
+    "else": {
+        "type": "object",
+        "required": [
+            "type"
+        ],
+        "if": {
+            "properties": {
+                "type": {
+                    "const": "PointSelector"
+                }
+            }
+        },
+        "then": {
+            "$ref": "PointSelector.json"
+        },
+        "else": {
+            "if": {
+                "properties": {
+                    "type": {
+                        "const": "FragmentSelector"
+                    }
+                }
+            },
+            "then": {
+                "$ref": "FragmentSelector.json"
+            },
+            "else": {
+                "if": {
+                    "properties": {
+                        "type": {
+                            "const": "SvgSelector"
+                        }
+                    }
+                },
+                "then": {
+                    "$ref": "SVGSelector.json"
+                },
+                "else": {
+                    "if": {
+                        "properties": {
+                            "type": {
+                                "const": "ImageApiSelector"
+                            }
+                        }
+                    },
+                    "then": {
+                        "$ref": "ImageAPISelector.json"
+                    },
+                    "else": {
+                        "if": {
+                            "properties": {
+                                "type": {
+                                    "const": "XPathSelector"
+                                }
+                            }
+                        },
+                        "then": {
+                            "$ref": "XPathSelector.json"
+                        },
+                        "else": {
+                            "if": {
+                                "properties": {
+                                    "type": {
+                                        "const": "CssSelector"
+                                    }
+                                }
+                            },
+                            "then": {
+                                "$ref": "CssSelector.json"
+                            },
+                            "else": {
+                                "if": {
+                                    "properties": {
+                                        "type": {
+                                            "const": "TextQuoteSelector"
+                                        }
+                                    }
+                                },
+                                "then": {
+                                    "$ref": "TextQuoteSelector.json"
+                                },
+                                "else": {
+                                    "if": {
+                                        "properties": {
+                                            "type": {
+                                                "const": "TextPositionSelector"
+                                            }
+                                        }
+                                    },
+                                    "then": {
+                                        "$ref": "TextPositionSelector.json"
+                                    },
+                                    "else": {
+                                        "if": {
+                                            "properties": {
+                                                "type": {
+                                                    "const": "DataPositionSelector"
+                                                }
+                                            }
+                                        },
+                                        "then": {
+                                            "$ref": "DataPositionSelector.json"
+                                        },
+                                        "else": {
+                                            "if": {
+                                                "properties": {
+                                                    "type": {
+                                                        "const": "RangeSelector"
+                                                    }
+                                                }
+                                            },
+                                            "then": {
+                                                "$ref": "RangeSelector.json"
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/SpecificResource.json b/schema/v4/SpecificResource.json
new file mode 100644
index 0000000..9773626
--- /dev/null
+++ b/schema/v4/SpecificResource.json
@@ -0,0 +1,103 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/SpecificResource.json",
+    "title": "SpecificResource",
+    "type": "object",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^SpecificResource$",
+            "default": "SpecificResource"
+        },
+        "format": {
+            "$ref": "properties.json#/$defs/format"
+        },
+        "accessibility": {
+            "type": "string"
+        },
+        "source": {
+            "oneOf": [
+                {
+                    "$ref": "properties.json#/$defs/id"
+                },
+                {
+                    "$ref": "Resource.json"
+                }
+            ]
+        },
+        "scope": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "selector": {
+            "oneOf": [
+                {
+                    "$ref": "Selector.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "$ref": "Selector.json"
+                    }
+                }
+            ]
+        },
+        "state": {
+            "oneOf": [
+                {
+                    "$ref": "State.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "$ref": "State.json"
+                    }
+                }
+            ]
+        },
+        "styleClass": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                }
+            ]
+        },
+        "renderedVia": {
+            "oneOf": [
+                {
+                    "$ref": "Agent.json"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "$ref": "Agent.json"
+                    }
+                }
+            ]
+        },
+        "purpose": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                }
+            ]
+        }
+    },
+    "required": [
+        "source"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/State.json b/schema/v4/State.json
new file mode 100644
index 0000000..4ae6da4
--- /dev/null
+++ b/schema/v4/State.json
@@ -0,0 +1,35 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/State.json",
+    "title": "State",
+    "type": "object",
+    "description": "W3C Web Annotation State (TimeState or HttpRequestState)",
+    "if": {
+        "properties": {
+            "type": {
+                "const": "TimeState"
+            }
+        },
+        "required": [
+            "type"
+        ]
+    },
+    "then": {
+        "$ref": "TimeState.json"
+    },
+    "else": {
+        "if": {
+            "properties": {
+                "type": {
+                    "const": "HttpRequestState"
+                }
+            },
+            "required": [
+                "type"
+            ]
+        },
+        "then": {
+            "$ref": "HttpRequestState.json"
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/Stylesheet.json b/schema/v4/Stylesheet.json
new file mode 100644
index 0000000..9d7ab97
--- /dev/null
+++ b/schema/v4/Stylesheet.json
@@ -0,0 +1,34 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Stylesheet.json",
+    "title": "Stylesheet",
+    "description": "W3C Web Annotation Stylesheet for rendering",
+    "if": {
+        "type": "string"
+    },
+    "then": {
+        "type": "string",
+        "format": "uri"
+    },
+    "else": {
+        "type": "object",
+        "title": "CssStylesheet",
+        "properties": {
+            "id": {
+                "type": "string",
+                "format": "uri"
+            },
+            "type": {
+                "type": "string",
+                "pattern": "^CssStylesheet$",
+                "default": "CssStylesheet"
+            },
+            "value": {
+                "type": "string"
+            }
+        },
+        "required": [
+            "type"
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/TextPositionSelector.json b/schema/v4/TextPositionSelector.json
new file mode 100644
index 0000000..8dca69c
--- /dev/null
+++ b/schema/v4/TextPositionSelector.json
@@ -0,0 +1,24 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/TextPositionSelector.json",
+    "title": "TextPositionSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^TextPositionSelector$",
+            "default": "TextPositionSelector"
+        },
+        "start": {
+            "type": "integer"
+        },
+        "end": {
+            "type": "integer"
+        }
+    },
+    "required": [
+        "type",
+        "start",
+        "end"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/TextQuoteSelector.json b/schema/v4/TextQuoteSelector.json
new file mode 100644
index 0000000..35e281e
--- /dev/null
+++ b/schema/v4/TextQuoteSelector.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/TextQuoteSelector.json",
+    "title": "TextQuoteSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^TextQuoteSelector$",
+            "default": "TextQuoteSelector"
+        },
+        "exact": {
+            "type": "string"
+        },
+        "prefix": {
+            "type": "string"
+        },
+        "suffix": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "type",
+        "exact"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/TextualBody.json b/schema/v4/TextualBody.json
new file mode 100644
index 0000000..4f5da4a
--- /dev/null
+++ b/schema/v4/TextualBody.json
@@ -0,0 +1,65 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/TextualBody.json",
+    "title": "TextualBody",
+    "description": "Annotation bodies which are TextualBody MUST have an type and value property.",
+    "type": "object",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "type": {
+            "type": "string",
+            "pattern": "^TextualBody$",
+            "default": "TextualBody"
+        },
+        "value": {
+            "type": "string"
+        },
+        "format": {
+            "$ref": "properties.json#/$defs/format"
+        },
+        "language": {
+            "type": "string"
+        },
+        "processingLanguage": {
+            "type": "string"
+        },
+        "textDirection": {
+            "$ref": "properties.json#/$defs/textDirection"
+        },
+        "purpose": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                }
+            ]
+        },
+        "creator": {
+            "oneOf": [
+                {
+                    "type": "string"
+                },
+                {
+                    "$ref": "Agent.json"
+                }
+            ]
+        },
+        "created": {
+            "type": "string"
+        },
+        "modified": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "value",
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/TimeState.json b/schema/v4/TimeState.json
new file mode 100644
index 0000000..49cd1ce
--- /dev/null
+++ b/schema/v4/TimeState.json
@@ -0,0 +1,30 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/TimeState.json",
+    "title": "TimeState",
+    "description": "W3C Web Annotation TimeState for temporal resource versions",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^TimeState$",
+            "default": "TimeState"
+        },
+        "sourceDate": {
+            "type": "string"
+        },
+        "sourceDateStart": {
+            "type": "string"
+        },
+        "sourceDateEnd": {
+            "type": "string"
+        },
+        "cached": {
+            "type": "string",
+            "format": "uri"
+        }
+    },
+    "required": [
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/Timeline.json b/schema/v4/Timeline.json
new file mode 100644
index 0000000..c26dee4
--- /dev/null
+++ b/schema/v4/Timeline.json
@@ -0,0 +1,30 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Timeline.json",
+    "title": "Timeline",
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "Container.json"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "type": {
+                    "type": "string",
+                    "pattern": "^Timeline$",
+                    "default": "Timeline"
+                },
+                "duration": {
+                    "$ref": "properties.json#/$defs/duration"
+                }
+            },
+            "required": [
+                "id",
+                "type",
+                "items",
+                "duration"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/XPathSelector.json b/schema/v4/XPathSelector.json
new file mode 100644
index 0000000..9f1b004
--- /dev/null
+++ b/schema/v4/XPathSelector.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/XPathSelector.json",
+    "title": "XPathSelector",
+    "type": "object",
+    "properties": {
+        "type": {
+            "type": "string",
+            "pattern": "^XPathSelector$",
+            "default": "XPathSelector"
+        },
+        "value": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "type",
+        "value"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/agent.json b/schema/v4/agent.json
new file mode 100644
index 0000000..f0741a9
--- /dev/null
+++ b/schema/v4/agent.json
@@ -0,0 +1,32 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Agent.json",
+    "title": "Agent",
+    "description": "W3C Web Annotation Agent (creator, generator)",
+    "type": "object",
+    "properties": {
+        "id": { "$ref": "properties.json#/$defs/id" },
+        "type": {
+            "type": "string",
+            "pattern": "^Agent$",
+            "default": "Agent"
+        },
+        "name": {
+            "type": "string"
+        },
+        "nickname": {
+            "type": "string"
+        },
+        "email": {
+            "type": "string"
+        },
+        "email_sha1": {
+            "type": "string"
+        },
+        "homepage": {
+            "type": "string",
+            "format": "uri"
+        }
+    },
+    "required": ["id", "type"]
+}
diff --git a/schema/v4/audiance.json b/schema/v4/audiance.json
new file mode 100644
index 0000000..7fd5491
--- /dev/null
+++ b/schema/v4/audiance.json
@@ -0,0 +1,16 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Audiance.json",
+    "title": "Audience",
+    "description": "W3C Web Annotation Audience",
+    "type": "object",
+    "properties": {
+        "id": { "$ref": "properties.json#/$defs/id" },
+        "type": {
+            "type": "string"
+        }
+    },
+    "required": [
+        "type"
+    ]
+}
\ No newline at end of file
diff --git a/schema/v4/check_refs.py b/schema/v4/check_refs.py
new file mode 100644
index 0000000..cfdbabf
--- /dev/null
+++ b/schema/v4/check_refs.py
@@ -0,0 +1,94 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any, Dict, Iterable, List, Tuple
+from urllib.parse import urljoin, urlparse
+from pathlib import PurePosixPath
+
+from referencing import Registry, Resource
+from referencing.exceptions import Unresolvable
+
+def iter_refs(node: Any, path: str = "#") -> Iterable[Tuple[str, str]]:
+    """
+    Yield ($ref_value, json_pointer_path_in_schema) for every $ref in a schema tree.
+    """
+    #print (f"Travesring {node}")
+    if isinstance(node, dict):
+        if "$ref" in node and isinstance(node["$ref"], str):
+            yield node["$ref"], path + "/$ref"
+        for k, v in node.items():
+            yield from iter_refs(v, f"{path}/{k}")
+    elif isinstance(node, list):
+        for i, v in enumerate(node):
+            yield from iter_refs(v, f"{path}/{i}")
+
+
+def build_registry_from_dir(schema_dir: str | Path) -> Tuple[Registry, Dict[str, Dict[str, Any]]]:
+    """
+    Load all *.json schemas under schema_dir into a referencing.Registry.
+
+    Each resource is keyed by:
+      - its $id, if present, else
+      - a file:// URI for its absolute path.
+    """
+    schema_dir = Path(schema_dir)
+    registry = Registry()
+    by_uri: Dict[str, Dict[str, Any]] = {}
+
+    for path in schema_dir.rglob("*.json"):
+        with path.open("r", encoding="utf-8") as f:
+            schema = json.load(f)
+
+        print (f"Loading {path.name}")
+        uri = schema.get("$id")
+        if not uri:
+            uri = path.resolve().as_uri()  # file:///.../schema.json
+
+        resource = Resource.from_contents(schema)
+        registry = registry.with_resource(uri, resource)
+        if uri in by_uri:
+            raise Exception(f"Duplicate schema ID {uri} found in {path.name}")
+
+        by_uri[uri] = schema
+
+    return registry, by_uri
+
+
+def find_missing_refs_in_dir(schema_dir: str | Path) -> List[Dict[str, str]]:
+    """
+    Returns a list of unresolved $refs across all schemas in schema_dir.
+    """
+    registry, schemas = build_registry_from_dir(schema_dir)
+    missing: List[Dict[str, str]] = []
+    for base_uri, schema in schemas.items():
+        resolver = registry.resolver(base_uri=base_uri)
+
+        for ref, where in iter_refs(schema):
+            # Make relative refs absolute against the schema's base URI
+            target = urljoin(base_uri, ref)
+
+            try:
+                resolver.lookup(target)
+            except Unresolvable:
+                missing.append(
+                    {
+                        "schema": base_uri,
+                        "ref": ref,
+                        "where": where,
+                        "resolved_target": target,
+                    }
+                )
+
+    return missing
+
+
+if __name__ == "__main__":
+    problems = find_missing_refs_in_dir(Path(__file__).resolve().parent)
+    if problems:
+        print("\nMissing/unresolvable $refs:")
+        for p in problems:
+            print(f"- In {p['schema'].split('/')[-1]}:\n at {p['where']}: {p['ref']}  (→ {p['resolved_target']})\n")
+        raise SystemExit(2)
+    else:
+        print("All $refs resolved.")
\ No newline at end of file
diff --git a/schema/v4/external.json b/schema/v4/external.json
new file mode 100644
index 0000000..9c34727
--- /dev/null
+++ b/schema/v4/external.json
@@ -0,0 +1,23 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/External.json",
+    "title": "LinkedResources",
+    "type": "array",
+    "items": {
+        "title": "linkedResource",
+        "type": "object",
+        "properties": {
+            "id": { "$ref": "properties.json#/$defs/id" },
+            "type": {
+                "type": "string"
+            },
+            "format": {
+                "$ref": "properties.json#/$defs/format"
+            },
+            "profile": {
+                "type": "string"
+            }
+        },
+        "required": ["id", "type"]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/main.json b/schema/v4/main.json
new file mode 100644
index 0000000..74a7468
--- /dev/null
+++ b/schema/v4/main.json
@@ -0,0 +1,70 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/main.json",
+    "title": "AbstractIIIFResource",
+    "type": "object",
+    "required": [
+        "type"
+    ],
+    "if": {
+        "properties": {
+            "type": {
+                "const": "Manifest"
+            }
+        }
+    },
+    "then": {
+        "$ref": "Manifest.json"
+    },
+    "else": {
+        "if": {
+            "properties": {
+                "type": {
+                    "const": "Collection"
+                }
+            }
+        },
+        "then": {
+            "$ref": "Collection.json"
+        },
+        "else": {
+            "if": {
+                "properties": {
+                    "type": {
+                        "const": "AnnotationCollection"
+                    }
+                }
+            },
+            "then": {
+                "$ref": "AnnotationCollection.json"
+            },
+            "else": {
+                "if": {
+                    "properties": {
+                        "type": {
+                            "const": "AnnotationPage"
+                        }
+                    }
+                },
+                "then": {
+                    "$ref": "AnnotationPage.json"
+                },
+                "else": {
+                    "if": {
+                        "properties": {
+                            "type": {
+                                "const": "Annotation"
+                            }
+                        }
+                    },
+                    "then": {
+                        "$ref": "Annotation.json"
+                    },
+                    "else": {
+                        "not": {}
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/metadata.json b/schema/v4/metadata.json
new file mode 100644
index 0000000..b24dc4c
--- /dev/null
+++ b/schema/v4/metadata.json
@@ -0,0 +1,9 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Metadata.json",
+    "type": "array",
+    "title": "Metadata",
+    "items": {
+        "$ref": "properties.json#/$defs/keyValueString"
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/properties.json b/schema/v4/properties.json
new file mode 100644
index 0000000..cd4da15
--- /dev/null
+++ b/schema/v4/properties.json
@@ -0,0 +1,151 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/properties.json",
+    "$defs": {
+        "context": {
+            "title": "context",
+            "type": "string",
+            "const": "http://iiif.io/api/presentation/4/context.json"
+        },
+        "id": {
+            "title": "id",
+            "description": "Id must be present and must be a URI",
+            "type": "string",
+            "format": "uri",
+            "pattern": "^http.*$"
+        },
+        "lngString": {
+            "title": "LngString",
+            "description": "Language string, must have a language and value must be an array.",
+            "type": "object",
+            "patternProperties": {
+                "^[a-zA-Z-][a-zA-Z-]*$": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                },
+                "^none$": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                }
+            }
+        },
+        "dimension": {
+            "title": "dimension",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "keyValueString": {
+            "title": "KeyValueString",
+            "type": "object",
+            "properties": {
+                "label": {
+                    "$ref": "#/$defs/lngString"
+                },
+                "value": {
+                    "$ref": "#/$defs/lngString"
+                }
+            },
+            "required": [
+                "label",
+                "value"
+            ]
+        },
+        "BCP47": {
+            "title": "BCP47",
+            "anyOf": [
+                {
+                    "type": "string",
+                    "pattern": "^[a-zA-Z-][a-zA-Z-]*$"
+                },
+                {
+                    "type": "string",
+                    "pattern": "^none$"
+                }
+            ]
+        },
+        "format": {
+            "title": "format",
+            "type": "string",
+            "pattern": "^[a-z][a-z]*/.*$"
+        },
+        "duration": {
+            "title": "duration",
+            "type": "number",
+            "exclusiveMinimum": 0
+        },
+        "textDirection": {
+            "title": "textDirection",
+            "description": "Text direction for processing from W3C Web Annotation Model",
+            "type": "string",
+            "enum": [
+                "ltr",
+                "rtl",
+                "auto"
+            ]
+        },
+        "viewingDirection": {
+            "title": "viewingDirection",
+            "type": "string",
+            "enum": [
+                "left-to-right",
+                "right-to-left",
+                "top-to-bottom",
+                "bottom-to-top"
+            ]
+        },
+        "behavior": {
+            "title": "behavior",
+            "type": "array",
+            "items": {
+                "type": "string",
+                "enum": [
+                    "auto-advance",
+                    "no-auto-advance",
+                    "repeat",
+                    "no-repeat",
+                    "unordered",
+                    "individuals",
+                    "continuous",
+                    "paged",
+                    "facing-pages",
+                    "non-paged",
+                    "multi-part",
+                    "together",
+                    "sequence",
+                    "thumbnail-nav",
+                    "no-nav",
+                    "hidden"
+                ]
+            }
+        },
+        "rights": {
+            "title": "rights",
+            "description": "Rights URI isn't from either Creative Commons or RightsStatements.org. Both require http links.",
+            "oneOf": [
+                {
+                    "type": "string",
+                    "format": "uri",
+                    "pattern": "http://creativecommons.org/licenses/.*"
+                },
+                {
+                    "type": "string",
+                    "format": "uri",
+                    "pattern": "http://creativecommons.org/publicdomain/.*"
+                },
+                {
+                    "type": "string",
+                    "format": "uri",
+                    "pattern": "http://rightsstatements.org/vocab/.*"
+                }
+            ]
+        },
+        "navDate": {
+            "type": "string",
+            "format": "date-time"
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/reference.json b/schema/v4/reference.json
new file mode 100644
index 0000000..0dce326
--- /dev/null
+++ b/schema/v4/reference.json
@@ -0,0 +1,41 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Reference.json",
+    "type": "object",
+    "title": "Reference",
+    "description": "Id. type, label but not items are required",
+    "properties": {
+        "id": {
+            "$ref": "properties.json#/$defs/id"
+        },
+        "label": {
+            "$ref": "properties.json#/$defs/lngString"
+        },
+        "type": {
+            "type": "string",
+            "enum": [
+                "Manifest",
+                "Collection",
+                "AnnotationCollection",
+                "AnnotationPage",
+                "Canvas",
+                "Range"
+            ]
+        },
+        "thumbnail": {
+            "type": "array",
+            "items": {
+                "$ref": "Resource.json"
+            }
+        }
+    },
+    "required": [
+        "id",
+        "type"
+    ],
+    "not": {
+        "required": [
+            "items"
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/v4/service.json b/schema/v4/service.json
new file mode 100644
index 0000000..f1d7451
--- /dev/null
+++ b/schema/v4/service.json
@@ -0,0 +1,52 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://iiif.io/api/presentation/4.0/schema/Service.json",
+    "title": "Services",
+    "type": "array",
+    "items": {
+        "oneOf": [
+            {
+                "type": "object",
+                "title": "serviceV3",
+                "properties": {
+                    "id": { "$ref": "properties.json#/$defs/id" },
+                    "type": {
+                        "type": "string",
+                        "pattern": "^Service$",
+                        "default": "Service"
+                    },
+                    "profile": {
+                        "type": "string"
+                    },
+                    "service": {
+                        "$ref": "Service.json"
+                    }
+                },
+                "required": [
+                    "id",
+                    "type"
+                ]
+            },
+            {
+                "type": "object",
+                "title": "serviceV2",
+                "properties": {
+                    "@id": { "$ref": "properties.json#/$defs/id" },
+                    "@type": {
+                        "type": "string"
+                    },
+                    "profile": {
+                        "type": "string"
+                    },
+                    "service": {
+                        "$ref": "Service.json"
+                    }
+                },
+                "required": [
+                    "@id",
+                    "@type"
+                ]
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/schema/validation4.py b/schema/validation4.py
new file mode 100644
index 0000000..5a17b3f
--- /dev/null
+++ b/schema/validation4.py
@@ -0,0 +1,68 @@
+from ast import main
+from pathlib import Path
+import json
+import sys
+
+from jsonschema import Draft202012Validator
+from referencing import Registry, Resource
+from referencing.jsonschema import DRAFT202012
+
+SCHEMA_DIR = Path("schema/v4")
+BASE_URI = "https://iiif.io/api/presentation/4.0/schema"
+
+def load_schema(path: Path) -> dict:
+    return json.loads(path.read_text(encoding="utf-8"))
+
+def validate(instance):
+    # Read all JSON documents in the SCHEMA_DIR and store them in schemas
+    schemas = {}
+    
+    # Iterate through all JSON files in the schema directory
+    for json_file in SCHEMA_DIR.glob("*.json"):
+        try:
+            schema_content = load_schema(json_file)
+            # Use the filename as a URI-like key for consistency
+            uri = f"{BASE_URI}/{json_file.name}"
+            schemas[uri] = schema_content
+            print(f"Loaded schema: {json_file.name}")
+        except (json.JSONDecodeError, IOError) as e:
+            print(f"Failed to load schema from {json_file}: {e}")
+
+    registry = Registry().with_resources(
+        (uri, Resource.from_contents(schema, default_specification=DRAFT202012))
+        for uri, schema in schemas.items()
+    )
+
+    main = schemas[f"{BASE_URI}/main.json"]
+    validator = Draft202012Validator(main, registry=registry)
+
+    validator.validate(instance)
+    print ("Validation successful")
+
+def main():
+    # Check if command line argument is provided
+    if len(sys.argv) < 2:
+        print("Usage: python validation4.py <json_file>")
+        sys.exit(1)
+    
+    # Get filename from first command line argument
+    filename = sys.argv[1]
+    
+    try:
+        # Read the JSON file and store in instance
+        with open(filename, 'r', encoding='utf-8') as f:
+            instance = json.load(f)
+        print(f"Checking: {filename}")
+        
+        # Validate the instance
+        validate(instance)
+        
+    except FileNotFoundError:
+        print(f"Error: File '{filename}' not found")
+        sys.exit(1)
+    except json.JSONDecodeError as e:
+        print(f"Error: Invalid JSON in file '{filename}': {e}")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file