{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://luciocola.github.io/stac-extension-liability-claims/json-schema/schema.json#",
  "title": "Liability and Claims Extension",
  "description": "STAC Liability and Claims Extension for Items and Collections. v1.2.0 adds optional CEOS-ARD integration for Analysis Ready Data quality certification.",
  "stac_version": "1.0.0",
  "version": "1.2.0",
  "oneOf": [
    {
      "$comment": "This is the schema for STAC Items.",
      "allOf": [
        {
          "$ref": "#/definitions/stac_extensions"
        },
        {
          "type": "object",
          "required": [
            "type",
            "properties",
            "assets"
          ],
          "properties": {
            "type": {
              "const": "Feature"
            },
            "properties": {
              "allOf": [
                {
                  "$ref": "#/definitions/require_any_field"
                },
                {
                  "$ref": "#/definitions/fields"
                }
              ]
            },
            "assets": {
              "type": "object",
              "additionalProperties": {
                "$ref": "#/definitions/asset_all_fields"
              }
            }
          }
        }
      ]
    },
    {
      "$comment": "This is the schema for STAC Collections.",
      "allOf": [
        {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "const": "Collection"
            },
            "summaries": {
              "$ref": "#/definitions/summaries"
            },
            "item_assets": {
              "type": "object",
              "additionalProperties": {
                "$ref": "#/definitions/asset_all_fields"
              }
            }
          }
        },
        {
          "$ref": "#/definitions/stac_extensions"
        }
      ]
    }
  ],
  "definitions": {
    "stac_extensions": {
      "type": "object",
      "required": [
        "stac_extensions"
      ],
      "properties": {
        "stac_extensions": {
          "type": "array",
          "contains": {
            "const": "https://luciocola.github.io/stac-extension-liability-claims/json-schema/schema.json"
          }
        }
      }
    },
    "require_any_field": {
      "$comment": "Please list all fields here so that we can force the existence of one of them in other parts of the schemas.",
      "anyOf": [
        {"required": ["liability:responsible_party"]},
        {"required": ["liability:claim_status"]},
        {"required": ["liability:claim_id"]},
        {"required": ["liability:claim_date"]},
        {"required": ["liability:claim_type"]},
        {"required": ["liability:coverage_area"]},
        {"required": ["liability:affected_parties"]},
        {"required": ["liability:damages_estimated"]},
        {"required": ["liability:damages_currency"]},
        {"required": ["liability:legal_jurisdiction"]},
        {"required": ["liability:incident_date"]},
        {"required": ["liability:resolution_date"]},
        {"required": ["liability:resolution_status"]},
        {"required": ["liability:insurance_provider"]},
        {"required": ["liability:policy_number"]},
        {"required": ["liability:evidence_refs"]},
        {"required": ["liability:notes"]},
        {"required": ["liability:origin"]},
        {"required": ["liability:quality"]},
        {"required": ["liability:prov"]},
        {"required": ["liability:ownership_did"]},
        {"required": ["liability:resolver_url"]}
      ]
    },
    "fields": {
      "$comment": "Add your new fields here. Don't require them here, do that above in the corresponding schema.",
      "type": "object",
      "properties": {
        "liability:responsible_party": {
          "type": "string",
          "description": "Name or identifier of the party responsible for the liability or claim"
        },
        "liability:claim_status": {
          "type": "string",
          "enum": ["pending", "under_investigation", "accepted", "rejected", "settled", "closed"],
          "description": "Current status of the liability claim"
        },
        "liability:claim_id": {
          "type": "string",
          "description": "Unique identifier for the liability claim"
        },
        "liability:claim_date": {
          "type": "string",
          "format": "date-time",
          "description": "Date when the claim was filed (RFC 3339 format)"
        },
        "liability:claim_type": {
          "type": "string",
          "enum": ["environmental", "property_damage", "personal_injury", "financial", "operational", "other"],
          "description": "Type or category of the liability claim"
        },
        "liability:coverage_area": {
          "type": "object",
          "description": "GeoJSON geometry representing the geographic area affected by the claim",
          "required": ["type"],
          "properties": {
            "type": {
              "type": "string",
              "enum": ["Point", "LineString", "Polygon", "MultiPoint", "MultiLineString", "MultiPolygon"]
            },
            "coordinates": {
              "type": "array"
            }
          }
        },
        "liability:affected_parties": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "name": {
                "type": "string",
                "description": "Name of the affected party"
              },
              "role": {
                "type": "string",
                "description": "Role or relationship to the claim (e.g., claimant, witness, third_party)"
              },
              "contact": {
                "type": "string",
                "description": "Contact information for the affected party"
              }
            }
          },
          "description": "List of parties affected by or involved in the claim"
        },
        "liability:damages_estimated": {
          "type": "number",
          "minimum": 0,
          "description": "Estimated monetary value of damages"
        },
        "liability:damages_currency": {
          "type": "string",
          "pattern": "^[A-Z]{3}$",
          "description": "Currency code for damages (ISO 4217, e.g., USD, EUR, GBP)"
        },
        "liability:legal_jurisdiction": {
          "type": "string",
          "description": "Legal jurisdiction under which the claim falls"
        },
        "liability:incident_date": {
          "type": "string",
          "format": "date-time",
          "description": "Date when the incident occurred that led to the claim (RFC 3339 format)"
        },
        "liability:resolution_date": {
          "type": "string",
          "format": "date-time",
          "description": "Date when the claim was resolved (RFC 3339 format)"
        },
        "liability:resolution_status": {
          "type": "string",
          "enum": ["in_favor", "against", "partial_settlement", "dismissed", "withdrawn"],
          "description": "Final resolution outcome of the claim"
        },
        "liability:insurance_provider": {
          "type": "string",
          "description": "Name of the insurance provider covering the claim"
        },
        "liability:policy_number": {
          "type": "string",
          "description": "Insurance policy number associated with the claim"
        },
        "liability:evidence_refs": {
          "type": "array",
          "items": {
            "type": "string",
            "format": "uri"
          },
          "description": "References to evidence documents, images, or other supporting materials (URIs or STAC Asset keys)"
        },
        "liability:notes": {
          "type": "string",
          "description": "Additional notes or comments about the claim"
        },
        "liability:origin": {
          "type": "string",
          "description": "Origin or source organization of the claim data"
        },
        "liability:ownership_did": {
          "type": "string",
          "pattern": "^did:[a-z]+:.+",
          "description": "Decentralized Identifier (DID) of the data owner. Supports did:web, did:key, and did:ion methods."
        },
        "liability:resolver_url": {
          "type": "string",
          "format": "uri",
          "description": "URL of the DID resolver endpoint used to resolve the ownership_did. Defaults to the W3C Universal Resolver at https://dev.uniresolver.io/1.0/identifiers/ if omitted."
        },
        "liability:quality": {
          "oneOf": [
            {"$ref": "https://luciocola.github.io/stac-extension-liability-claims/json-schema/iso19157-quality.json#/definitions/iso19157_data_quality"},
            {"$ref": "#/definitions/iso19115_quality_report"}
          ],
          "description": "Data quality report using ISO 19157-1:2023 (RECOMMENDED) or ISO 19115/19115-4 (backward compatibility). ISO 19157 provides comprehensive quality framework with metaquality, usability, and standardized evaluation methods."
        },
        "liability:prov": {
          "$ref": "#/definitions/prov_document",
          "description": "W3C PROV-JSON provenance information following PROV-DM model with entities, activities, and agents. For OGC Building Blocks compatibility, prefer referencing ogc.ogc-utils.prov. Maintains identity and provenance compatibility across all quality frameworks."
        },
        "ard:geometric_accuracy": {
          "type": "number",
          "minimum": 0,
          "description": "Flattened geometric accuracy metric from ISO 19157 DQ_AbsoluteExternalPositionalAccuracy, enabling simple API queries. Value is mirrored from liability:quality.report[] for queryability. Unit specified in ard:geometric_accuracy_unit."
        },
        "ard:geometric_accuracy_unit": {
          "type": "string",
          "description": "Unit of measurement for geometric accuracy (e.g., 'meter', 'degree'). Corresponds to ISO 19157 valueUnit."
        },
        "ard:geometric_accuracy_type": {
          "type": "string",
          "description": "Error statistic type for geometric accuracy (e.g., 'rRMSE', 'CE90', 'LE90'). Corresponds to ISO 19157 measureDescription."
        },
        "ard:radiometric_accuracy": {
          "type": "number",
          "minimum": 0,
          "description": "Flattened radiometric accuracy metric from ISO 19157 DQ_ThematicClassificationCorrectness, enabling simple API queries. Value is mirrored from liability:quality.report[] for queryability. Unit specified in ard:radiometric_accuracy_unit."
        },
        "ard:radiometric_accuracy_unit": {
          "type": "string",
          "description": "Unit of measurement for radiometric accuracy (e.g., 'percentage', 'dB', 'W/m²/sr/μm'). Corresponds to ISO 19157 valueUnit."
        },
        "ard:cloud_coverage": {
          "type": "number",
          "minimum": 0,
          "maximum": 100,
          "description": "Cloud coverage percentage for optical sensor products (0-100). Enables simple API filtering for cloud-free imagery."
        },
        "ard:data_mask_coverage": {
          "type": "number",
          "minimum": 0,
          "maximum": 100,
          "description": "Data mask coverage percentage for radar sensor products (0-100). Indicates invalid/masked pixels due to radar shadowing, layover, or other artifacts."
        },
        "ard:specification_compliance": {
          "type": "boolean",
          "description": "Boolean indicating overall compliance with CEOS-ARD Product Family Specification (PFS). True if all Threshold requirements met."
        },
        "ard:pfs_threshold_compliance": {
          "type": "string",
          "enum": ["all", "partial", "none"],
          "description": "Categorical status of CEOS-ARD PFS Threshold requirements compliance. 'all' = all requirements met, 'partial' = some requirements met, 'none' = no compliance."
        },
        "ard:pfs_target_compliance": {
          "type": "number",
          "minimum": 0,
          "maximum": 100,
          "description": "Percentage (0-100) of CEOS-ARD PFS Target requirements achieved. Target requirements represent aspirational quality goals beyond mandatory Threshold requirements."
        }
      },
      "patternProperties": {
        "^(?!liability:)": {}
      },
      "additionalProperties": false
    },
    "asset_fields": {
      "$comment": "Asset-level fields for security classification and access restrictions",
      "type": "object",
      "properties": {
        "liability:security_classification": {
          "type": "string",
          "enum": ["public", "internal", "confidential", "restricted", "classified"],
          "description": "Security classification level of the asset"
        },
        "liability:access_restrictions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "List of access restrictions or requirements (e.g., legal hold, court order, privacy constraints)"
        },
        "liability:required_roles": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Roles required to access this asset (enforced at API level via OpenAPI security schemes)"
        }
      },
      "patternProperties": {
        "^(?!liability:)": {}
      },
      "additionalProperties": false
    },
    "asset_all_fields": {
      "$comment": "Combined fields for asset objects - includes both item-level and asset-specific fields",
      "type": "object",
      "properties": {
        "liability:origin": {
          "type": "string",
          "description": "Origin or source organization of the claim data"
        },
        "liability:quality": {
          "oneOf": [
            {"$ref": "https://luciocola.github.io/stac-extension-liability-claims/json-schema/iso19157-quality.json#/definitions/iso19157_data_quality"},
            {"$ref": "#/definitions/iso19115_quality_report"}
          ],
          "description": "Data quality report using ISO 19157-1:2023 (RECOMMENDED) or ISO 19115/19115-4 (backward compatibility)"
        },
        "liability:access_control": {
          "type": "object",
          "description": "DEPRECATED in v1.1.0: Use API-level security schemes (OpenAPI securitySchemes) instead. This field will be removed in v2.0.0.",
          "deprecated": true
        },
        "liability:alternate": {
          "type": "object",
          "description": "DEPRECATED in v1.1.0: Use standard STAC assets with different hrefs or links with rel='alternate' instead. This field will be removed in v2.0.0.",
          "deprecated": true
        },
        "liability:security_classification": {
          "type": "string",
          "enum": ["public", "internal", "confidential", "restricted", "classified"],
          "description": "Security classification level of the asset"
        },
        "liability:access_restrictions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "List of access restrictions or requirements (e.g., legal hold, court order, privacy constraints)"
        },
        "liability:required_roles": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Roles required to access this asset (enforced at API level via OpenAPI security schemes)"
        }
      },
      "patternProperties": {
        "^(?!liability:)": {}
      },
      "additionalProperties": false
    },
    "iso19115_conformance_result": {
      "$comment": "Conformance result for ISO 19115 DQ assessments",
      "type": "object",
      "properties": {
        "specification": {
          "type": "string",
          "description": "Referenced specification or standard (e.g., ISO/TS 19115)"
        },
        "explanation": {
          "type": "string",
          "description": "Explanation of conformance result"
        },
        "pass": {
          "type": "boolean",
          "description": "Whether the data conforms to the referenced specification"
        }
      },
      "required": ["specification", "pass"],
      "additionalProperties": true
    },
    "iso19115_measure": {
      "type": "object",
      "not": {
        "required": ["type"]
      },
      "properties": {
        "description": { "type": "string" },
        "value": { "type": ["number", "string", "boolean", "object", "null"] },
        "valueType": { "type": "string", "description": "Type of value (e.g., percentage, absolute, count)" },
        "units": { "type": "string", "description": "Units for numeric values, if applicable" },
        "method": { "type": "string", "description": "Method used to compute the measure" },
        "reference": { "type": "string", "format": "uri", "description": "Reference to dataset, standard or procedure used" }
      },
      "additionalProperties": true
    },
    "iso19115_completeness": {
      "type": "object",
      "properties": {
        "type": { "const": "completeness" },
        "scope": { "type": "string", "description": "Scope of completeness (dataset, feature, attribute)" },
        "measure": { "$ref": "#/definitions/iso19115_measure" },
        "conformance": { "$ref": "#/definitions/iso19115_conformance_result" }
      },
      "required": ["type", "measure"],
      "additionalProperties": true
    },
    "iso19115_logical_consistency": {
      "type": "object",
      "properties": {
        "type": { "const": "logicalConsistency" },
        "description": { "type": "string" },
        "testsPerformed": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Descriptions of checks or tests performed"
        },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_positional_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "positionalAccuracy" },
        "accuracyValue": { "type": "number", "description": "Numeric accuracy value (e.g., metres)" },
        "units": { "type": "string" },
        "method": { "type": "string", "description": "Method used to estimate accuracy" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_thematic_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "thematicAccuracy" },
        "description": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type", "measure"],
      "additionalProperties": true
    },
    "iso19115_temporal_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "temporalAccuracy" },
        "description": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type", "measure"],
      "additionalProperties": true
    },
    "iso19115_attribute_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "attributeAccuracy" },
        "attribute": { "type": "string", "description": "Name of the attribute evaluated" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type", "attribute", "measure"],
      "additionalProperties": true
    },
    "iso19115_topological_consistency": {
      "type": "object",
      "properties": {
        "type": { "const": "topologicalConsistency" },
        "description": { "type": "string" },
        "tests": { "type": "array", "items": { "type": "string" } },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_lineage": {
      "type": "object",
      "properties": {
        "type": { "const": "lineage" },
        "statement": { "type": "string", "description": "General explanation of the data producer's knowledge about the lineage of a dataset" },
        "scope": { 
          "type": "object",
          "description": "Type of resource and/or extent to which the lineage information applies",
          "properties": {
            "level": { "type": "string", "enum": ["dataset", "series", "feature", "attribute", "featureType", "propertyType", "fieldSession", "software", "service", "model", "tile", "metadata", "initiative", "sample", "document", "repository", "aggregate", "product", "collection", "coverage", "application"] },
            "extent": { "type": "object", "description": "GeoJSON geometry defining the extent" },
            "levelDescription": { "type": "string" }
          }
        },
        "processStep": {
          "type": "array",
          "items": {
            "type": "object",
            "description": "Information about an event or transformation in the life of the dataset",
            "properties": {
              "description": { "type": "string", "description": "Description of the event, including related parameters or tolerances" },
              "rationale": { "type": "string", "description": "Requirement or purpose for the process step" },
              "stepDateTime": { "type": "string", "format": "date-time", "description": "Date, time, and/or range of the process step" },
              "processor": {
                "type": "array",
                "description": "Identification of, and means of communication with, person(s) and organization(s) associated with the process step",
                "items": {
                  "type": "object",
                  "properties": {
                    "name": { "type": "string" },
                    "organizationName": { "type": "string" },
                    "role": { "type": "string" },
                    "contactInfo": {
                      "type": "object",
                      "properties": {
                        "email": { "type": "string", "format": "email" },
                        "phone": { "type": "string" },
                        "address": { "type": "string" },
                        "onlineResource": { "type": "string", "format": "uri" }
                      }
                    }
                  }
                }
              },
              "reference": {
                "type": "array",
                "description": "Process step documentation",
                "items": {
                  "type": "object",
                  "properties": {
                    "title": { "type": "string" },
                    "date": { "type": "string", "format": "date-time" },
                    "identifier": { "type": "string" },
                    "url": { "type": "string", "format": "uri" }
                  },
                  "required": ["title"]
                }
              },
              "scope": {
                "type": "object",
                "description": "Type of resource and/or extent to which the process step applies",
                "properties": {
                  "level": { "type": "string" },
                  "extent": { "type": "object" }
                }
              },
              "processingInformation": {
                "type": "object",
                "description": "Additional details about the process step (ISO 19115-4 extension)",
                "properties": {
                  "identifier": { "type": "string" },
                  "softwareReference": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "properties": {
                        "title": { "type": "string" },
                        "version": { "type": "string" },
                        "identifier": { "type": "string" }
                      }
                    }
                  },
                  "procedureDescription": { "type": "string" },
                  "documentation": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "properties": {
                        "title": { "type": "string" },
                        "url": { "type": "string", "format": "uri" }
                      }
                    }
                  },
                  "runTimeParameters": { "type": "string" },
                  "algorithm": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "properties": {
                        "title": { "type": "string" },
                        "description": { "type": "string" },
                        "citation": { "type": "object" }
                      }
                    }
                  }
                }
              }
            },
            "required": ["description"]
          }
        },
        "source": {
          "type": "array",
          "description": "Information about the source data used in creating the data specified by the scope",
          "items": {
            "type": "object",
            "properties": {
              "description": { "type": "string", "description": "Detailed description of the level of the source data" },
              "sourceCitation": {
                "type": "object",
                "description": "Recommended reference to be used for the source data",
                "properties": {
                  "title": { "type": "string" },
                  "date": { "type": "string", "format": "date-time" },
                  "identifier": { "type": "string" },
                  "url": { "type": "string", "format": "uri" }
                },
                "required": ["title"]
              },
              "sourceReferenceSystem": {
                "type": "object",
                "description": "Spatial reference system used by the source data",
                "properties": {
                  "code": { "type": "string", "description": "EPSG or other CRS code" },
                  "codeSpace": { "type": "string", "default": "EPSG" },
                  "version": { "type": "string" }
                }
              },
              "sourceMetadata": {
                "type": "array",
                "description": "References to metadata for the source",
                "items": {
                  "type": "object",
                  "properties": {
                    "title": { "type": "string" },
                    "url": { "type": "string", "format": "uri" }
                  }
                }
              },
              "scope": {
                "type": "object",
                "description": "Type of resource and/or extent of the source",
                "properties": {
                  "level": { "type": "string" },
                  "extent": { "type": "object" }
                }
              },
              "sourceExtent": {
                "type": "object",
                "description": "Spatial and temporal extent of the source data",
                "properties": {
                  "geographicElement": { "type": "object", "description": "GeoJSON geometry" },
                  "temporalElement": {
                    "type": "object",
                    "properties": {
                      "extent": {
                        "type": "array",
                        "minItems": 2,
                        "maxItems": 2,
                        "items": { "type": "string", "format": "date-time" }
                      }
                    }
                  }
                }
              }
            }
          }
        },
        "additionalDocumentation": {
          "type": "array",
          "description": "Additional documentation (ISO 19115-1:2014)",
          "items": {
            "type": "object",
            "properties": {
              "title": { "type": "string" },
              "date": { "type": "string", "format": "date-time" },
              "url": { "type": "string", "format": "uri" },
              "description": { "type": "string" }
            },
            "required": ["title"]
          }
        }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_4_radiometric_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "radiometricAccuracy" },
        "description": { "type": "string" },
        "calibrationAccuracy": { "type": "number", "description": "Radiometric calibration accuracy" },
        "units": { "type": "string" },
        "method": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_4_sensor_quality": {
      "type": "object",
      "properties": {
        "type": { "const": "sensorQuality" },
        "sensorType": { "type": "string" },
        "calibrationStatus": { "type": "string", "enum": ["calibrated", "uncalibrated", "partial", "unknown"] },
        "calibrationDate": { "type": "string", "format": "date-time" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_4_cloud_coverage": {
      "type": "object",
      "properties": {
        "type": { "const": "cloudCoverage" },
        "coveragePercentage": { "type": "number", "minimum": 0, "maximum": 100 },
        "assessmentMethod": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_4_processing_level": {
      "type": "object",
      "properties": {
        "type": { "const": "processingLevel" },
        "level": { "type": "string", "description": "Processing level code (e.g., L1A, L1B, L2A)" },
        "description": { "type": "string" },
        "processingDate": { "type": "string", "format": "date-time" },
        "processor": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type", "level"],
      "additionalProperties": true
    },
    "iso19115_4_usability_assessment": {
      "type": "object",
      "properties": {
        "type": { "const": "usabilityAssessment" },
        "usabilityScore": { "type": "number", "minimum": 0, "maximum": 1 },
        "limitations": { "type": "array", "items": { "type": "string" } },
        "intendedUse": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_absolute_external_positional_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "absoluteExternalPositionalAccuracy" },
        "horizontalAccuracy": { "type": "number", "description": "Horizontal absolute accuracy value" },
        "verticalAccuracy": { "type": "number", "description": "Vertical absolute accuracy value" },
        "units": { "type": "string" },
        "method": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_relative_internal_positional_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "relativeInternalPositionalAccuracy" },
        "accuracyValue": { "type": "number", "description": "Relative positional accuracy between features" },
        "units": { "type": "string" },
        "method": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_gridded_data_positional_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "griddedDataPositionalAccuracy" },
        "accuracyValue": { "type": "number", "description": "Positional accuracy for gridded/raster data" },
        "units": { "type": "string" },
        "method": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_non_quantitative_attribute_correctness": {
      "type": "object",
      "properties": {
        "type": { "const": "nonQuantitativeAttributeCorrectness" },
        "attribute": { "type": "string", "description": "Name of the non-quantitative attribute" },
        "correctnessRate": { "type": "number", "minimum": 0, "maximum": 1, "description": "Rate of correct attribute values" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_quantitative_attribute_accuracy": {
      "type": "object",
      "properties": {
        "type": { "const": "quantitativeAttributeAccuracy" },
        "attribute": { "type": "string", "description": "Name of the quantitative attribute" },
        "accuracyValue": { "type": "number", "description": "Accuracy of quantitative attribute values" },
        "units": { "type": "string" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_format_consistency": {
      "type": "object",
      "properties": {
        "type": { "const": "formatConsistency" },
        "description": { "type": "string" },
        "conformanceRate": { "type": "number", "minimum": 0, "maximum": 1, "description": "Rate of format conformance" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_domain_consistency": {
      "type": "object",
      "properties": {
        "type": { "const": "domainConsistency" },
        "description": { "type": "string" },
        "conformanceRate": { "type": "number", "minimum": 0, "maximum": 1, "description": "Rate of domain value conformance" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "dgiwg_temporal_validity": {
      "type": "object",
      "properties": {
        "type": { "const": "temporalValidity" },
        "validFrom": { "type": "string", "format": "date-time", "description": "Start of temporal validity period" },
        "validTo": { "type": "string", "format": "date-time", "description": "End of temporal validity period" },
        "measure": { "$ref": "#/definitions/iso19115_measure" }
      },
      "required": ["type"],
      "additionalProperties": true
    },
    "iso19115_element": {
      "type": "object",
      "properties": {
        "elementType": {
          "type": "string",
          "description": "ISO 19115/19115-4/DGIWG data quality class",
          "enum": [
            "completeness",
            "logicalConsistency",
            "positionalAccuracy",
            "thematicAccuracy",
            "temporalAccuracy",
            "attributeAccuracy",
            "topologicalConsistency",
            "lineage",
            "radiometricAccuracy",
            "sensorQuality",
            "cloudCoverage",
            "processingLevel",
            "usabilityAssessment",
            "absoluteExternalPositionalAccuracy",
            "relativeInternalPositionalAccuracy",
            "griddedDataPositionalAccuracy",
            "nonQuantitativeAttributeCorrectness",
            "quantitativeAttributeAccuracy",
            "formatConsistency",
            "domainConsistency",
            "temporalValidity",
            "other"
          ]
        },
        "summary": { "type": "string", "description": "Human-readable summary of the element" },
        "detail": {
          "oneOf": [
            { "$ref": "#/definitions/iso19115_completeness" },
            { "$ref": "#/definitions/iso19115_logical_consistency" },
            { "$ref": "#/definitions/iso19115_positional_accuracy" },
            { "$ref": "#/definitions/iso19115_thematic_accuracy" },
            { "$ref": "#/definitions/iso19115_temporal_accuracy" },
            { "$ref": "#/definitions/iso19115_attribute_accuracy" },
            { "$ref": "#/definitions/iso19115_topological_consistency" },
            { "$ref": "#/definitions/iso19115_lineage" },
            { "$ref": "#/definitions/iso19115_4_radiometric_accuracy" },
            { "$ref": "#/definitions/iso19115_4_sensor_quality" },
            { "$ref": "#/definitions/iso19115_4_cloud_coverage" },
            { "$ref": "#/definitions/iso19115_4_processing_level" },
            { "$ref": "#/definitions/iso19115_4_usability_assessment" },
            { "$ref": "#/definitions/dgiwg_absolute_external_positional_accuracy" },
            { "$ref": "#/definitions/dgiwg_relative_internal_positional_accuracy" },
            { "$ref": "#/definitions/dgiwg_gridded_data_positional_accuracy" },
            { "$ref": "#/definitions/dgiwg_non_quantitative_attribute_correctness" },
            { "$ref": "#/definitions/dgiwg_quantitative_attribute_accuracy" },
            { "$ref": "#/definitions/dgiwg_format_consistency" },
            { "$ref": "#/definitions/dgiwg_domain_consistency" },
            { "$ref": "#/definitions/dgiwg_temporal_validity" },
            { "$ref": "#/definitions/iso19115_measure" }
          ]
        },
        "conformance": { "$ref": "#/definitions/iso19115_conformance_result" }
      },
      "required": ["elementType"],
      "additionalProperties": true
    },
    "iso19115_quality_report": {
      "$comment": "Top-level ISO 19115-like quality report structure (expanded)",
      "type": "object",
      "properties": {
        "reportId": { "type": "string", "description": "Identifier for the quality report" },
        "scope": { "type": "string", "description": "Scope of the report (e.g., dataset, series, feature)" },
        "date": { "type": "string", "format": "date-time", "description": "Date when the quality report was generated" },
        "version": { "type": "string", "description": "Version of the quality report" },
        "elements": { "type": "array", "items": { "$ref": "#/definitions/iso19115_element" }, "description": "List of data quality elements and their measures" },
        "summary": { "type": "string" }
      },
      "additionalProperties": true
    },
    "prov_entity": {
      "$comment": "W3C PROV Entity - A physical, digital, conceptual, or other kind of thing with some fixed aspects",
      "type": "object",
      "properties": {
        "prov:type": { "type": "string", "description": "Type of the entity" },
        "prov:label": { "type": "string", "description": "Human-readable label" },
        "prov:location": { "type": "string", "description": "Location of the entity" },
        "prov:value": { "description": "Value of the entity" }
      },
      "additionalProperties": true
    },
    "prov_activity": {
      "$comment": "W3C PROV Activity - Something that occurs over a period of time and acts upon or with entities",
      "type": "object",
      "properties": {
        "prov:startTime": { "type": "string", "format": "date-time", "description": "Start time of the activity" },
        "prov:endTime": { "type": "string", "format": "date-time", "description": "End time of the activity" },
        "prov:type": { "type": "string", "description": "Type of the activity" },
        "prov:label": { "type": "string", "description": "Human-readable label" },
        "prov:location": { "type": "string", "description": "Location where the activity occurred" }
      },
      "additionalProperties": true
    },
    "prov_agent": {
      "$comment": "W3C PROV Agent - Something that bears some form of responsibility for an activity",
      "type": "object",
      "properties": {
        "prov:type": { "type": "string", "description": "Type of the agent (Person, Organization, SoftwareAgent)" },
        "prov:label": { "type": "string", "description": "Human-readable label" },
        "prov:location": { "type": "string", "description": "Location of the agent" }
      },
      "additionalProperties": true
    },
    "prov_relation": {
      "$comment": "W3C PROV Relation - Generic relation structure",
      "type": "object",
      "properties": {
        "prov:entity": { "type": "string", "description": "Reference to an entity ID" },
        "prov:activity": { "type": "string", "description": "Reference to an activity ID" },
        "prov:agent": { "type": "string", "description": "Reference to an agent ID" },
        "prov:time": { "type": "string", "format": "date-time", "description": "Time of the relation" },
        "prov:type": { "type": "string", "description": "Type of the relation" }
      },
      "additionalProperties": true
    },
    "prov_document": {
      "$comment": "W3C PROV-JSON Document - Complete provenance document following PROV-JSON serialization",
      "type": "object",
      "properties": {
        "prefix": {
          "type": "object",
          "description": "Namespace prefixes for qualified names",
          "additionalProperties": { "type": "string" }
        },
        "entity": {
          "type": "object",
          "description": "Map of entity identifiers to entity objects",
          "additionalProperties": { "$ref": "#/definitions/prov_entity" }
        },
        "activity": {
          "type": "object",
          "description": "Map of activity identifiers to activity objects",
          "additionalProperties": { "$ref": "#/definitions/prov_activity" }
        },
        "agent": {
          "type": "object",
          "description": "Map of agent identifiers to agent objects",
          "additionalProperties": { "$ref": "#/definitions/prov_agent" }
        },
        "wasGeneratedBy": {
          "type": "object",
          "description": "Entity was generated by Activity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "used": {
          "type": "object",
          "description": "Activity used Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasInformedBy": {
          "type": "object",
          "description": "Activity was informed by another Activity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasStartedBy": {
          "type": "object",
          "description": "Activity was started by Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasEndedBy": {
          "type": "object",
          "description": "Activity was ended by Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasInvalidatedBy": {
          "type": "object",
          "description": "Entity was invalidated by Activity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasDerivedFrom": {
          "type": "object",
          "description": "Entity was derived from another Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasAttributedTo": {
          "type": "object",
          "description": "Entity was attributed to Agent",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasAssociatedWith": {
          "type": "object",
          "description": "Activity was associated with Agent",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "actedOnBehalfOf": {
          "type": "object",
          "description": "Agent acted on behalf of another Agent",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "wasInfluencedBy": {
          "type": "object",
          "description": "Generic influence relation",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "specializationOf": {
          "type": "object",
          "description": "Entity is a specialization of another Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "alternateOf": {
          "type": "object",
          "description": "Entity is an alternate of another Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        },
        "hadMember": {
          "type": "object",
          "description": "Collection had member Entity",
          "additionalProperties": { "$ref": "#/definitions/prov_relation" }
        }
      },
      "additionalProperties": true
    },
    "summaries": {
      "$comment": "Collection-level summaries of liability-claims fields (aligned with T21-DQ4IPT pattern)",
      "type": "object",
      "description": "Summarized information about the range of values in the Collection for liability-claims fields",
      "properties": {
        "liability:claim_status": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": ["pending", "under_investigation", "accepted", "rejected", "settled", "closed"]
          },
          "description": "Array of unique claim status values in the collection"
        },
        "liability:claim_type": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": ["environmental", "property_damage", "personal_injury", "financial", "operational", "other"]
          },
          "description": "Array of unique claim type values in the collection"
        },
        "liability:security_classification": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": ["public", "internal", "confidential", "restricted", "classified"]
          },
          "description": "Array of unique security classification levels in the collection"
        },
        "liability:responsible_party": {
          "type": "array",
          "items": {"type": "string"},
          "description": "Array of unique responsible parties in the collection"
        },
        "liability:damages_estimated": {
          "oneOf": [
            {
              "type": "object",
              "properties": {
                "minimum": {"type": "number", "description": "Minimum estimated damages"},
                "maximum": {"type": "number", "description": "Maximum estimated damages"}
              },
              "required": ["minimum", "maximum"]
            },
            {
              "type": "array",
              "items": {"type": "number"},
              "description": "Array of unique damage estimate values"
            }
          ],
          "description": "Range or array of damage estimates in the collection"
        },
        "liability:legal_jurisdiction": {
          "type": "array",
          "items": {"type": "string"},
          "description": "Array of unique legal jurisdictions in the collection"
        },
        "liability:origin": {
          "type": "array",
          "items": {"type": "string"},
          "description": "Array of unique data origins in the collection"
        }
      },
      "patternProperties": {
        "^(?!liability:)": {}
      },
      "additionalProperties": false
    }
  }
}