diff --git a/DEPENDENCIES b/DEPENDENCIES
index 2ba8526..8b89553 100644
--- a/DEPENDENCIES
+++ b/DEPENDENCIES
@@ -34,4 +34,5 @@ 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
+jsonschema-2019-09 https://github.com/json-schema-org/json-schema-spec 41014ea723120ce70b314d72f863c6929d9f3cfd
 openapi https://github.com/OAI/OpenAPI-Specification 3.1.1
diff --git a/configuration.json b/configuration.json
index 9665251..2079c69 100644
--- a/configuration.json
+++ b/configuration.json
@@ -274,6 +274,10 @@
       "base": "https://json-schema.org/draft/2020-12",
       "path": "./vendor/jsonschema-2020-12"
     },
+    "jsonschema/2019-09": {
+      "base": "https://json-schema.org/draft/2019-09",
+      "path": "./vendor/jsonschema-2019-09"
+    },
     "openapi/v1.2": {
       "base": "https://raw.githubusercontent.com/oai/openapi-specification/master/schemas/v1.2",
       "path": "./vendor/openapi/schemas/v1.2"
diff --git a/vendor/jsonschema-2019-09.mask b/vendor/jsonschema-2019-09.mask
new file mode 100644
index 0000000..e133411
--- /dev/null
+++ b/vendor/jsonschema-2019-09.mask
@@ -0,0 +1,9 @@
+.travis.yml
+CONTRIBUTING.md
+jsonschema-core.xml
+jsonschema-hyperschema.xml
+jsonschema-validation.xml
+Makefile
+README.md
+relative-json-pointer.xml
+output/verbose-example.json
diff --git a/vendor/jsonschema-2019-09/hyper-schema.json b/vendor/jsonschema-2019-09/hyper-schema.json
new file mode 100644
index 0000000..28f9ad4
--- /dev/null
+++ b/vendor/jsonschema-2019-09/hyper-schema.json
@@ -0,0 +1,26 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/hyper-schema",
+    "$id": "https://json-schema.org/draft/2019-09/hyper-schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/core": true,
+        "https://json-schema.org/draft/2019-09/vocab/applicator": true,
+        "https://json-schema.org/draft/2019-09/vocab/validation": true,
+        "https://json-schema.org/draft/2019-09/vocab/meta-data": true,
+        "https://json-schema.org/draft/2019-09/vocab/format": false,
+        "https://json-schema.org/draft/2019-09/vocab/content": true,
+        "https://json-schema.org/draft/2019-09/vocab/hyper-schema": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "JSON Hyper-Schema",
+    "allOf": [
+        {"$ref": "https://json-schema.org/draft/2019-09/schema"},
+        {"$ref": "https://json-schema.org/draft/2019-09/meta/hyper-schema"}
+    ],
+    "links": [
+        {
+            "rel": "self",
+            "href": "{+%24id}"
+        }
+    ]
+}
diff --git a/vendor/jsonschema-2019-09/links.json b/vendor/jsonschema-2019-09/links.json
new file mode 100644
index 0000000..96a600f
--- /dev/null
+++ b/vendor/jsonschema-2019-09/links.json
@@ -0,0 +1,91 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/links",
+    "title": "Link Description Object",
+    "allOf": [
+        { "required": [ "rel", "href" ] },
+        { "$ref": "#/$defs/noRequiredFields" }
+    ],
+    "$defs": {
+        "noRequiredFields": {
+            "type": "object",
+            "properties": {
+                "anchor": {
+                    "type": "string",
+                    "format": "uri-template"
+                },
+                "anchorPointer": {
+                    "type": "string",
+                    "anyOf": [
+                        { "format": "json-pointer" },
+                        { "format": "relative-json-pointer" }
+                    ]
+                },
+                "rel": {
+                    "anyOf": [
+                        { "type": "string" },
+                        {
+                            "type": "array",
+                            "items": { "type": "string" },
+                            "minItems": 1
+                        }
+                    ]
+                },
+                "href": {
+                    "type": "string",
+                    "format": "uri-template"
+                },
+                "hrefSchema": {
+                    "$ref": "https://json-schema.org/draft/2019-09/hyper-schema",
+                    "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": {
+                    "$ref": "https://json-schema.org/draft/2019-09/hyper-schema",
+                    "default": true
+                },
+                "targetMediaType": {
+                    "type": "string"
+                },
+                "targetHints": { },
+                "headerSchema": {
+                    "$ref": "https://json-schema.org/draft/2019-09/hyper-schema",
+                    "default": true
+                },
+                "submissionMediaType": {
+                    "type": "string",
+                    "default": "application/json"
+                },
+                "submissionSchema": {
+                    "$ref": "https://json-schema.org/draft/2019-09/hyper-schema",
+                    "default": true
+                },
+                "$comment": {
+                    "type": "string"
+                }
+            }
+        }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/applicator.json b/vendor/jsonschema-2019-09/meta/applicator.json
new file mode 100644
index 0000000..24a1cc4
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/applicator.json
@@ -0,0 +1,56 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/applicator",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/applicator": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Applicator vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "additionalItems": { "$recursiveRef": "#" },
+        "unevaluatedItems": { "$recursiveRef": "#" },
+        "items": {
+            "anyOf": [
+                { "$recursiveRef": "#" },
+                { "$ref": "#/$defs/schemaArray" }
+            ]
+        },
+        "contains": { "$recursiveRef": "#" },
+        "additionalProperties": { "$recursiveRef": "#" },
+        "unevaluatedProperties": { "$recursiveRef": "#" },
+        "properties": {
+            "type": "object",
+            "additionalProperties": { "$recursiveRef": "#" },
+            "default": {}
+        },
+        "patternProperties": {
+            "type": "object",
+            "additionalProperties": { "$recursiveRef": "#" },
+            "propertyNames": { "format": "regex" },
+            "default": {}
+        },
+        "dependentSchemas": {
+            "type": "object",
+            "additionalProperties": {
+                "$recursiveRef": "#"
+            }
+        },
+        "propertyNames": { "$recursiveRef": "#" },
+        "if": { "$recursiveRef": "#" },
+        "then": { "$recursiveRef": "#" },
+        "else": { "$recursiveRef": "#" },
+        "allOf": { "$ref": "#/$defs/schemaArray" },
+        "anyOf": { "$ref": "#/$defs/schemaArray" },
+        "oneOf": { "$ref": "#/$defs/schemaArray" },
+        "not": { "$recursiveRef": "#" }
+    },
+    "$defs": {
+        "schemaArray": {
+            "type": "array",
+            "minItems": 1,
+            "items": { "$recursiveRef": "#" }
+        }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/content.json b/vendor/jsonschema-2019-09/meta/content.json
new file mode 100644
index 0000000..f6752a8
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/content.json
@@ -0,0 +1,17 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/content",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/content": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Content vocabulary meta-schema",
+
+    "type": ["object", "boolean"],
+    "properties": {
+        "contentMediaType": { "type": "string" },
+        "contentEncoding": { "type": "string" },
+        "contentSchema": { "$recursiveRef": "#" }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/core.json b/vendor/jsonschema-2019-09/meta/core.json
new file mode 100644
index 0000000..eb708a5
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/core.json
@@ -0,0 +1,57 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/core",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/core": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Core vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "$id": {
+            "type": "string",
+            "format": "uri-reference",
+            "$comment": "Non-empty fragments not allowed.",
+            "pattern": "^[^#]*#?$"
+        },
+        "$schema": {
+            "type": "string",
+            "format": "uri"
+        },
+        "$anchor": {
+            "type": "string",
+            "pattern": "^[A-Za-z][-A-Za-z0-9.:_]*$"
+        },
+        "$ref": {
+            "type": "string",
+            "format": "uri-reference"
+        },
+        "$recursiveRef": {
+            "type": "string",
+            "format": "uri-reference"
+        },
+        "$recursiveAnchor": {
+            "type": "boolean",
+            "default": false
+        },
+        "$vocabulary": {
+            "type": "object",
+            "propertyNames": {
+                "type": "string",
+                "format": "uri"
+            },
+            "additionalProperties": {
+                "type": "boolean"
+            }
+        },
+        "$comment": {
+            "type": "string"
+        },
+        "$defs": {
+            "type": "object",
+            "additionalProperties": { "$recursiveRef": "#" },
+            "default": {}
+        }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/format.json b/vendor/jsonschema-2019-09/meta/format.json
new file mode 100644
index 0000000..09bbfdd
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/format.json
@@ -0,0 +1,14 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/format",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/format": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Format vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "format": { "type": "string" }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/hyper-schema.json b/vendor/jsonschema-2019-09/meta/hyper-schema.json
new file mode 100644
index 0000000..3d23058
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/hyper-schema.json
@@ -0,0 +1,29 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/hyper-schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/hyper-schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/hyper-schema": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "JSON Hyper-Schema Vocabulary Schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "base": {
+            "type": "string",
+            "format": "uri-template"
+        },
+        "links": {
+            "type": "array",
+            "items": {
+                "$ref": "https://json-schema.org/draft/2019-09/links"
+            }
+        }
+    },
+    "links": [
+        {
+            "rel": "self",
+            "href": "{+%24id}"
+        }
+    ]
+}
diff --git a/vendor/jsonschema-2019-09/meta/meta-data.json b/vendor/jsonschema-2019-09/meta/meta-data.json
new file mode 100644
index 0000000..da04cff
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/meta-data.json
@@ -0,0 +1,37 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/meta-data",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/meta-data": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Meta-data vocabulary meta-schema",
+
+    "type": ["object", "boolean"],
+    "properties": {
+        "title": {
+            "type": "string"
+        },
+        "description": {
+            "type": "string"
+        },
+        "default": true,
+        "deprecated": {
+            "type": "boolean",
+            "default": false
+        },
+        "readOnly": {
+            "type": "boolean",
+            "default": false
+        },
+        "writeOnly": {
+            "type": "boolean",
+            "default": false
+        },
+        "examples": {
+            "type": "array",
+            "items": true
+        }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/meta/validation.json b/vendor/jsonschema-2019-09/meta/validation.json
new file mode 100644
index 0000000..9f59677
--- /dev/null
+++ b/vendor/jsonschema-2019-09/meta/validation.json
@@ -0,0 +1,98 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/meta/validation",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/validation": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Validation vocabulary meta-schema",
+    "type": ["object", "boolean"],
+    "properties": {
+        "multipleOf": {
+            "type": "number",
+            "exclusiveMinimum": 0
+        },
+        "maximum": {
+            "type": "number"
+        },
+        "exclusiveMaximum": {
+            "type": "number"
+        },
+        "minimum": {
+            "type": "number"
+        },
+        "exclusiveMinimum": {
+            "type": "number"
+        },
+        "maxLength": { "$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": "#/$defs/stringArray"
+            }
+        },
+        "const": true,
+        "enum": {
+            "type": "array",
+            "items": true
+        },
+        "type": {
+            "anyOf": [
+                { "$ref": "#/$defs/simpleTypes" },
+                {
+                    "type": "array",
+                    "items": { "$ref": "#/$defs/simpleTypes" },
+                    "minItems": 1,
+                    "uniqueItems": true
+                }
+            ]
+        }
+    },
+    "$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-2019-09/output/hyper-schema.json b/vendor/jsonschema-2019-09/output/hyper-schema.json
new file mode 100644
index 0000000..34e6730
--- /dev/null
+++ b/vendor/jsonschema-2019-09/output/hyper-schema.json
@@ -0,0 +1,62 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/output/hyper-schema",
+    "title": "JSON Hyper-Schema Output",
+    "type": "array",
+    "items": {
+        "allOf": [
+            {"$ref": "https://json-schema.org/draft/2019-09/links#/$defs/noRequiredFields" }
+        ],
+        "type": "object",
+        "required": [
+            "contextUri",
+            "contextPointer",
+            "rel",
+            "attachmentPointer"
+        ],
+        "if": { "required": [ "hrefSchema" ] },
+        "then": { "required": [ "hrefInputTemplates", "hrefPrepopulatedInput" ] },
+        "else": { "required": [ "targetUri" ] },
+        "properties": {
+            "contextUri": {
+                "$comment": "The fully resolved URI of the link context, including a fragment if it is possible to construct one for the given media type and instance",
+                "type": "string",
+                "format": "uri"
+            },
+            "contextPointer": {
+                "$comment": "The absolute JSON Pointer to the location in the instance that is the context of the link.  If the context resource supports JSON Pointer fragments, this will the string form of the identical JSON Pointer",
+                "type": "string",
+                "format": "json-pointer"
+            },
+            "rel": {
+                "type": "string"
+            },
+            "targetUri": {
+                "$comment": "The fully resolved target URI",
+                "type": "string",
+                "format": "uri"
+            },
+            "hrefInputTemplates": {
+                "$comment": "The list of partially resolved URI Templates, starting with \"href\", followed by applicable \"base\" values from nearest to furthest.",
+                "type": "array",
+                "items": {
+                    "type": "string",
+                    "format": "uri-template"
+                }
+            },
+            "hrefPrepopulatedInput": {
+                "$comment": "The initial data set to be presented with the input form when URI Template input is accepted.",
+                "type": "object",
+                "propertyNames": {
+                    "$comment": "These are all URI Template variable names, specifically the 'varname' production from RFC 6570, Section 2.3",
+                    "pattern": "^(?:\\w|(?:%[a-f\\d]{2}))+(?:\\.(?:\\w|(?:%[a-f\\d]{2})))*$"
+                }
+            },
+            "attachmentPointer": {
+                "$comment": "The absolute JSON Pointer, in string form, of the position to which this resolved link applies",
+                "type": "string",
+                "format": "json-pointer"
+            }
+        }
+    }
+}
diff --git a/vendor/jsonschema-2019-09/output/schema.json b/vendor/jsonschema-2019-09/output/schema.json
new file mode 100644
index 0000000..bef8593
--- /dev/null
+++ b/vendor/jsonschema-2019-09/output/schema.json
@@ -0,0 +1,86 @@
+{
+  "$schema": "https://json-schema.org/draft/2019-09/schema",
+  "$id": "https://json-schema.org/draft/2019-09/output/schema",
+  "description": "A schema that validates the minimum requirements for validation output",
+
+  "oneOf": [
+    { "$ref": "#/$defs/flag" },
+    { "$ref": "#/$defs/basic" },
+    { "$ref": "#/$defs/detailed" },
+    { "$ref": "#/$defs/verbose" }
+  ],
+  "$defs": {
+    "outputUnit":{
+      "properties": {
+        "valid": { "type": "boolean" },
+        "keywordLocation": {
+          "type": "string",
+          "format": "uri-reference"
+        },
+        "absoluteKeywordLocation": {
+          "type": "string",
+          "format": "uri"
+        },
+        "instanceLocation": {
+          "type": "string",
+          "format": "uri-reference"
+        },
+        "errors": {
+          "$ref": "#/$defs/outputUnitArray"
+        },
+        "annotations": {
+          "$ref": "#/$defs/outputUnitArray"
+        }
+      },
+      "required": [ "valid", "keywordLocation", "instanceLocation" ],
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "valid": { "const": false }
+            }
+          },
+          "then": {
+            "required": [ "errors" ]
+          }
+        },
+        {
+          "if": {
+            "anyOf": [
+              {
+                "properties": {
+                  "keywordLocation": {
+                    "pattern": "/\\$ref/"
+                  }
+                }
+              },
+              {
+                "properties": {
+                  "keywordLocation": {
+                    "pattern": "/\\$recursiveRef/"
+                  }
+                }
+              }
+            ]
+          },
+          "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-2019-09/schema.json b/vendor/jsonschema-2019-09/schema.json
new file mode 100644
index 0000000..2248a0c
--- /dev/null
+++ b/vendor/jsonschema-2019-09/schema.json
@@ -0,0 +1,42 @@
+{
+    "$schema": "https://json-schema.org/draft/2019-09/schema",
+    "$id": "https://json-schema.org/draft/2019-09/schema",
+    "$vocabulary": {
+        "https://json-schema.org/draft/2019-09/vocab/core": true,
+        "https://json-schema.org/draft/2019-09/vocab/applicator": true,
+        "https://json-schema.org/draft/2019-09/vocab/validation": true,
+        "https://json-schema.org/draft/2019-09/vocab/meta-data": true,
+        "https://json-schema.org/draft/2019-09/vocab/format": false,
+        "https://json-schema.org/draft/2019-09/vocab/content": true
+    },
+    "$recursiveAnchor": true,
+
+    "title": "Core and Validation specifications meta-schema",
+    "allOf": [
+        {"$ref": "meta/core"},
+        {"$ref": "meta/applicator"},
+        {"$ref": "meta/validation"},
+        {"$ref": "meta/meta-data"},
+        {"$ref": "meta/format"},
+        {"$ref": "meta/content"}
+    ],
+    "type": ["object", "boolean"],
+    "properties": {
+        "definitions": {
+            "$comment": "While no longer an official keyword as it is replaced by $defs, this keyword is retained in the meta-schema to prevent incompatible extensions as it remains in common use.",
+            "type": "object",
+            "additionalProperties": { "$recursiveRef": "#" },
+            "default": {}
+        },
+        "dependencies": {
+            "$comment": "\"dependencies\" is no longer a keyword, but schema authors should avoid redefining it to facilitate a smooth transition to \"dependentSchemas\" and \"dependentRequired\"",
+            "type": "object",
+            "additionalProperties": {
+                "anyOf": [
+                    { "$recursiveRef": "#" },
+                    { "$ref": "meta/validation#/$defs/stringArray" }
+                ]
+            }
+        }
+    }
+}