diff --git a/DEPENDENCIES b/DEPENDENCIES
index 9f2cbf7..3c10c7e 100644
--- a/DEPENDENCIES
+++ b/DEPENDENCIES
@@ -33,3 +33,4 @@ cloudevents-1-0-1 https://github.com/cloudevents/spec v1.0.1
 cloudevents-1-0-2 https://github.com/cloudevents/spec v1.0.2
 riskine-ontology-1-0-0 https://github.com/riskine/ontology v1.0.0
 jsr https://github.com/jsr-io/jsr 0e218a1d98b52f4c67b99a5c00742ffc3a3dda7d
+jsonschema-2020-12 https://github.com/json-schema-org/json-schema-spec 769daad75a9553562333a8937a187741cb708c72
diff --git a/configuration.json b/configuration.json
index 4f00cbf..f7a333d 100644
--- a/configuration.json
+++ b/configuration.json
@@ -111,6 +111,12 @@
       "email": "help@jsr.io",
       "github": "jsr-io",
       "website": "https://jsr.io"
+    },
+    "jsonschema": {
+      "title": "JSON Schema",
+      "description": "The organisation responsible for the JSON Schema specification",
+      "github": "json-schema-org",
+      "website": "https://json-schema.org"
     }
   },
   "schemas": {
@@ -256,6 +262,10 @@
     "jsr": {
       "base": "https://jsr.io/schema",
       "path": "./vendor/jsr"
+    },
+    "jsonschema/2020-12": {
+      "base": "https://json-schema.org/draft/2020-12",
+      "path": "./vendor/jsonschema-2020-12"
     }
   }
 }
diff --git a/vendor/jsonschema-2020-12.mask b/vendor/jsonschema-2020-12.mask
new file mode 100644
index 0000000..67a7045
--- /dev/null
+++ b/vendor/jsonschema-2020-12.mask
@@ -0,0 +1,11 @@
+adr
+archive
+.travis.yml
+CONTRIBUTING.md
+jsonschema-core.xml
+jsonschema-validation.xml
+Makefile
+README.md
+relative-json-pointer.xml
+output/verbose-example.json
+output/hyper-schema.json
diff --git a/vendor/jsonschema-2020-12/hyper-schema.json b/vendor/jsonschema-2020-12/hyper-schema.json
new file mode 100644
index 0000000..eb4f0b3
--- /dev/null
+++ b/vendor/jsonschema-2020-12/hyper-schema.json
@@ -0,0 +1,27 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/hyper-schema",
+    "$id": "https://json-schema.org/draft/2020-12/hyper-schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/core": true,
+        "https://json-schema.org/draft/2020-12/vocab/applicator": true,
+        "https://json-schema.org/draft/2020-12/vocab/unevaluated": true,
+        "https://json-schema.org/draft/2020-12/vocab/validation": true,
+        "https://json-schema.org/draft/2020-12/vocab/meta-data": true,
+        "https://json-schema.org/draft/2020-12/vocab/format-annotation": true,
+        "https://json-schema.org/draft/2020-12/vocab/content": true,
+        "https://json-schema.org/draft/2019-09/vocab/hyper-schema": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "JSON Hyper-Schema",
+    "allOf": [
+        { "$ref": "https://json-schema.org/draft/2020-12/schema" },
+        { "$ref": "https://json-schema.org/draft/2020-12/meta/hyper-schema" }
+    ],
+    "links": [
+        {
+            "rel": "self",
+            "href": "{+%24id}"
+        }
+    ]
+}
diff --git a/vendor/jsonschema-2020-12/links.json b/vendor/jsonschema-2020-12/links.json
new file mode 100644
index 0000000..c71690e
--- /dev/null
+++ b/vendor/jsonschema-2020-12/links.json
@@ -0,0 +1,85 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/links",
+    "title": "Link Description Object",
+
+    "type": "object",
+    "properties": {
+        "anchor": {
+            "type": "string",
+            "format": "uri-template"
+        },
+        "anchorPointer": {
+            "type": "string",
+            "anyOf": [
+                { "format": "json-pointer" },
+                { "format": "relative-json-pointer" }
+            ]
+        },
+        "rel": {
+            "anyOf": [
+                { "type": "string" },
+                {
+                    "type": "array",
+                    "items": { "type": "string" },
+                    "minItems": 1
+                }
+            ]
+        },
+        "href": {
+            "type": "string",
+            "format": "uri-template"
+        },
+        "hrefSchema": {
+            "$dynamicRef": "https://json-schema.org/draft/2020-12/hyper-schema#meta",
+            "default": false
+        },
+        "templatePointers": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "string",
+                "anyOf": [
+                    { "format": "json-pointer" },
+                    { "format": "relative-json-pointer" }
+                ]
+            }
+        },
+        "templateRequired": {
+            "type": "array",
+            "items": {
+                "type": "string"
+            },
+            "uniqueItems": true
+        },
+        "title": {
+            "type": "string"
+        },
+        "description": {
+            "type": "string"
+        },
+        "targetSchema": {
+            "$dynamicRef": "https://json-schema.org/draft/2020-12/hyper-schema#meta",
+            "default": true
+        },
+        "targetMediaType": {
+            "type": "string"
+        },
+        "targetHints": {},
+        "headerSchema": {
+            "$dynamicRef": "https://json-schema.org/draft/2020-12/hyper-schema#meta",
+            "default": true
+        },
+        "submissionMediaType": {
+            "type": "string",
+            "default": "application/json"
+        },
+        "submissionSchema": {
+            "$dynamicRef": "https://json-schema.org/draft/2020-12/hyper-schema#meta",
+            "default": true
+        },
+        "$comment": {
+            "type": "string"
+        }
+    },
+    "required": [ "rel", "href" ]
+}
diff --git a/vendor/jsonschema-2020-12/meta/applicator.json b/vendor/jsonschema-2020-12/meta/applicator.json
new file mode 100644
index 0000000..ca69923
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/applicator.json
@@ -0,0 +1,48 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/applicator",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/applicator": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Applicator vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "prefixItems": { "$ref": "#/$defs/schemaArray" },
+        "items": { "$dynamicRef": "#meta" },
+        "contains": { "$dynamicRef": "#meta" },
+        "additionalProperties": { "$dynamicRef": "#meta" },
+        "properties": {
+            "type": "object",
+            "additionalProperties": { "$dynamicRef": "#meta" },
+            "default": {}
+        },
+        "patternProperties": {
+            "type": "object",
+            "additionalProperties": { "$dynamicRef": "#meta" },
+            "propertyNames": { "format": "regex" },
+            "default": {}
+        },
+        "dependentSchemas": {
+            "type": "object",
+            "additionalProperties": { "$dynamicRef": "#meta" },
+            "default": {}
+        },
+        "propertyNames": { "$dynamicRef": "#meta" },
+        "if": { "$dynamicRef": "#meta" },
+        "then": { "$dynamicRef": "#meta" },
+        "else": { "$dynamicRef": "#meta" },
+        "allOf": { "$ref": "#/$defs/schemaArray" },
+        "anyOf": { "$ref": "#/$defs/schemaArray" },
+        "oneOf": { "$ref": "#/$defs/schemaArray" },
+        "not": { "$dynamicRef": "#meta" }
+    },
+    "$defs": {
+        "schemaArray": {
+            "type": "array",
+            "minItems": 1,
+            "items": { "$dynamicRef": "#meta" }
+        }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/content.json b/vendor/jsonschema-2020-12/meta/content.json
new file mode 100644
index 0000000..2f6e056
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/content.json
@@ -0,0 +1,17 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/content",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/content": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Content vocabulary meta-schema",
+
+    "type": ["object", "boolean"],
+    "properties": {
+        "contentEncoding": { "type": "string" },
+        "contentMediaType": { "type": "string" },
+        "contentSchema": { "$dynamicRef": "#meta" }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/core.json b/vendor/jsonschema-2020-12/meta/core.json
new file mode 100644
index 0000000..dfc092d
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/core.json
@@ -0,0 +1,51 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/core",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/core": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Core vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "$id": {
+            "$ref": "#/$defs/uriReferenceString",
+            "$comment": "Non-empty fragments not allowed.",
+            "pattern": "^[^#]*#?$"
+        },
+        "$schema": { "$ref": "#/$defs/uriString" },
+        "$ref": { "$ref": "#/$defs/uriReferenceString" },
+        "$anchor": { "$ref": "#/$defs/anchorString" },
+        "$dynamicRef": { "$ref": "#/$defs/uriReferenceString" },
+        "$dynamicAnchor": { "$ref": "#/$defs/anchorString" },
+        "$vocabulary": {
+            "type": "object",
+            "propertyNames": { "$ref": "#/$defs/uriString" },
+            "additionalProperties": {
+                "type": "boolean"
+            }
+        },
+        "$comment": {
+            "type": "string"
+        },
+        "$defs": {
+            "type": "object",
+            "additionalProperties": { "$dynamicRef": "#meta" }
+        }
+    },
+    "$defs": {
+        "anchorString": {
+            "type": "string",
+            "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
+        },
+        "uriString": {
+            "type": "string",
+            "format": "uri"
+        },
+        "uriReferenceString": {
+            "type": "string",
+            "format": "uri-reference"
+        }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/format-annotation.json b/vendor/jsonschema-2020-12/meta/format-annotation.json
new file mode 100644
index 0000000..51ef7ea
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/format-annotation.json
@@ -0,0 +1,14 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/format-annotation",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/format-annotation": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Format vocabulary meta-schema for annotation results",
+    "type": ["object", "boolean"],
+    "properties": {
+        "format": { "type": "string" }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/format-assertion.json b/vendor/jsonschema-2020-12/meta/format-assertion.json
new file mode 100644
index 0000000..5e73fd7
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/format-assertion.json
@@ -0,0 +1,14 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/format-assertion",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/format-assertion": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Format vocabulary meta-schema for assertion results",
+    "type": ["object", "boolean"],
+    "properties": {
+        "format": { "type": "string" }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/hyper-schema.json b/vendor/jsonschema-2020-12/meta/hyper-schema.json
new file mode 100644
index 0000000..62a3136
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/hyper-schema.json
@@ -0,0 +1,29 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/hyper-schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/hyper-schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/hyper-schema": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "JSON Hyper-Schema Vocabulary Schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "base": {
+            "type": "string",
+            "format": "uri-template"
+        },
+        "links": {
+            "type": "array",
+            "items": {
+                "$ref": "https://json-schema.org/draft/2020-12/links"
+            }
+        }
+    },
+    "links": [
+        {
+            "rel": "self",
+            "href": "{+%24id}"
+        }
+    ]
+}
diff --git a/vendor/jsonschema-2020-12/meta/meta-data.json b/vendor/jsonschema-2020-12/meta/meta-data.json
new file mode 100644
index 0000000..05cbc22
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/meta-data.json
@@ -0,0 +1,37 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/meta-data",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/meta-data": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Meta-data vocabulary meta-schema",
+
+    "type": ["object", "boolean"],
+    "properties": {
+        "title": {
+            "type": "string"
+        },
+        "description": {
+            "type": "string"
+        },
+        "default": true,
+        "deprecated": {
+            "type": "boolean",
+            "default": false
+        },
+        "readOnly": {
+            "type": "boolean",
+            "default": false
+        },
+        "writeOnly": {
+            "type": "boolean",
+            "default": false
+        },
+        "examples": {
+            "type": "array",
+            "items": true
+        }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/unevaluated.json b/vendor/jsonschema-2020-12/meta/unevaluated.json
new file mode 100644
index 0000000..5f62a3f
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/unevaluated.json
@@ -0,0 +1,15 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/unevaluated",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/unevaluated": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Unevaluated applicator vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "unevaluatedItems": { "$dynamicRef": "#meta" },
+        "unevaluatedProperties": { "$dynamicRef": "#meta" }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/meta/validation.json b/vendor/jsonschema-2020-12/meta/validation.json
new file mode 100644
index 0000000..606b87b
--- /dev/null
+++ b/vendor/jsonschema-2020-12/meta/validation.json
@@ -0,0 +1,98 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/meta/validation",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/validation": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Validation vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "type": {
+            "anyOf": [
+                { "$ref": "#/$defs/simpleTypes" },
+                {
+                    "type": "array",
+                    "items": { "$ref": "#/$defs/simpleTypes" },
+                    "minItems": 1,
+                    "uniqueItems": true
+                }
+            ]
+        },
+        "const": true,
+        "enum": {
+            "type": "array",
+            "items": true
+        },
+        "multipleOf": {
+            "type": "number",
+            "exclusiveMinimum": 0
+        },
+        "maximum": {
+            "type": "number"
+        },
+        "exclusiveMaximum": {
+            "type": "number"
+        },
+        "minimum": {
+            "type": "number"
+        },
+        "exclusiveMinimum": {
+            "type": "number"
+        },
+        "maxLength": { "$ref": "#/$defs/nonNegativeInteger" },
+        "minLength": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
+        "pattern": {
+            "type": "string",
+            "format": "regex"
+        },
+        "maxItems": { "$ref": "#/$defs/nonNegativeInteger" },
+        "minItems": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
+        "uniqueItems": {
+            "type": "boolean",
+            "default": false
+        },
+        "maxContains": { "$ref": "#/$defs/nonNegativeInteger" },
+        "minContains": {
+            "$ref": "#/$defs/nonNegativeInteger",
+            "default": 1
+        },
+        "maxProperties": { "$ref": "#/$defs/nonNegativeInteger" },
+        "minProperties": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
+        "required": { "$ref": "#/$defs/stringArray" },
+        "dependentRequired": {
+            "type": "object",
+            "additionalProperties": {
+                "$ref": "#/$defs/stringArray"
+            }
+        }
+    },
+    "$defs": {
+        "nonNegativeInteger": {
+            "type": "integer",
+            "minimum": 0
+        },
+        "nonNegativeIntegerDefault0": {
+            "$ref": "#/$defs/nonNegativeInteger",
+            "default": 0
+        },
+        "simpleTypes": {
+            "enum": [
+                "array",
+                "boolean",
+                "integer",
+                "null",
+                "number",
+                "object",
+                "string"
+            ]
+        },
+        "stringArray": {
+            "type": "array",
+            "items": { "type": "string" },
+            "uniqueItems": true,
+            "default": []
+        }
+    }
+}
diff --git a/vendor/jsonschema-2020-12/output/schema.json b/vendor/jsonschema-2020-12/output/schema.json
new file mode 100644
index 0000000..1eef288
--- /dev/null
+++ b/vendor/jsonschema-2020-12/output/schema.json
@@ -0,0 +1,96 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://json-schema.org/draft/2020-12/output/schema",
+  "description": "A schema that validates the minimum requirements for validation output",
+
+  "anyOf": [
+    { "$ref": "#/$defs/flag" },
+    { "$ref": "#/$defs/basic" },
+    { "$ref": "#/$defs/detailed" },
+    { "$ref": "#/$defs/verbose" }
+  ],
+  "$defs": {
+    "outputUnit":{
+      "properties": {
+        "valid": { "type": "boolean" },
+        "keywordLocation": {
+          "type": "string",
+          "format": "json-pointer"
+        },
+        "absoluteKeywordLocation": {
+          "type": "string",
+          "format": "uri"
+        },
+        "instanceLocation": {
+          "type": "string",
+          "format": "json-pointer"
+        },
+        "error": {
+          "type": "string"
+        },
+        "errors": {
+          "$ref": "#/$defs/outputUnitArray"
+        },
+        "annotations": {
+          "$ref": "#/$defs/outputUnitArray"
+        }
+      },
+      "required": [ "valid", "keywordLocation", "instanceLocation" ],
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "valid": { "const": false }
+            }
+          },
+          "then": {
+            "anyOf": [
+              {
+                "required": [ "error" ]
+              },
+              {
+                "required": [ "errors" ]
+              }
+            ]
+          }
+        },
+        {
+          "if": {
+            "anyOf": [
+              {
+                "properties": {
+                  "keywordLocation": {
+                    "pattern": "/\\$ref/"
+                  }
+                }
+              },
+              {
+                "properties": {
+                  "keywordLocation": {
+                    "pattern": "/\\$dynamicRef/"
+                  }
+                }
+              }
+            ]
+          },
+          "then": {
+            "required": [ "absoluteKeywordLocation" ]
+          }
+        }
+      ]
+    },
+    "outputUnitArray": {
+      "type": "array",
+      "items": { "$ref": "#/$defs/outputUnit" }
+    },
+    "flag": {
+      "properties": {
+        "valid": { "type": "boolean" }
+      },
+      "required": [ "valid" ]
+    },
+    "basic": { "$ref": "#/$defs/outputUnit" },
+    "detailed": { "$ref": "#/$defs/outputUnit" },
+    "verbose": { "$ref": "#/$defs/outputUnit" }
+  }
+}
diff --git a/vendor/jsonschema-2020-12/schema.json b/vendor/jsonschema-2020-12/schema.json
new file mode 100644
index 0000000..d5e2d31
--- /dev/null
+++ b/vendor/jsonschema-2020-12/schema.json
@@ -0,0 +1,58 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://json-schema.org/draft/2020-12/schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2020-12/vocab/core": true,
+        "https://json-schema.org/draft/2020-12/vocab/applicator": true,
+        "https://json-schema.org/draft/2020-12/vocab/unevaluated": true,
+        "https://json-schema.org/draft/2020-12/vocab/validation": true,
+        "https://json-schema.org/draft/2020-12/vocab/meta-data": true,
+        "https://json-schema.org/draft/2020-12/vocab/format-annotation": true,
+        "https://json-schema.org/draft/2020-12/vocab/content": true
+    },
+    "$dynamicAnchor": "meta",
+
+    "title": "Core and Validation specifications meta-schema",
+    "allOf": [
+        {"$ref": "meta/core"},
+        {"$ref": "meta/applicator"},
+        {"$ref": "meta/unevaluated"},
+        {"$ref": "meta/validation"},
+        {"$ref": "meta/meta-data"},
+        {"$ref": "meta/format-annotation"},
+        {"$ref": "meta/content"}
+    ],
+    "type": ["object", "boolean"],
+    "$comment": "This meta-schema also defines keywords that have appeared in previous drafts in order to prevent incompatible extensions as they remain in common use.",
+    "properties": {
+        "definitions": {
+            "$comment": "\"definitions\" has been replaced by \"$defs\".",
+            "type": "object",
+            "additionalProperties": { "$dynamicRef": "#meta" },
+            "deprecated": true,
+            "default": {}
+        },
+        "dependencies": {
+            "$comment": "\"dependencies\" has been split and replaced by \"dependentSchemas\" and \"dependentRequired\" in order to serve their differing semantics.",
+            "type": "object",
+            "additionalProperties": {
+                "anyOf": [
+                    { "$dynamicRef": "#meta" },
+                    { "$ref": "meta/validation#/$defs/stringArray" }
+                ]
+            },
+            "deprecated": true,
+            "default": {}
+        },
+        "$recursiveAnchor": {
+            "$comment": "\"$recursiveAnchor\" has been replaced by \"$dynamicAnchor\".",
+            "$ref": "meta/core#/$defs/anchorString",
+            "deprecated": true
+        },
+        "$recursiveRef": {
+            "$comment": "\"$recursiveRef\" has been replaced by \"$dynamicRef\".",
+            "$ref": "meta/core#/$defs/uriReferenceString",
+            "deprecated": true
+        }
+    }
+}