{
    "$schema": "http://json-schema.org/draft-07/schema#",

    "definitions": {
        "nameType": {
            "type": "string",
            "enum": [
                "Organizational",
                "Personal"
            ]
        },
        "nameIdentifiers": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "nameIdentifier": {"type": "string"},
                    "nameIdentifierScheme": {"type": "string"},
                    "schemeURI": {"type": "string", "format": "uri"}
                },
                "required": ["nameIdentifier", "nameIdentifierScheme"]
            },
            "uniqueItems": true
        },
        "affiliations": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "affiliation": {"type": "string"}
                },
                "required": ["affiliation"]
            },
            "uniqueItems": true
        },
        "titleType": {
            "type": "string",
            "enum": [
                "AlternativeTitle",
                "Subtitle",
                "TranslatedTitle",
                "Other"
            ]
        },
        "contributorType": {
            "type": "string",
            "enum": [
                "ContactPerson",
                "DataCollector",
                "DataCurator",
                "DataManager",
                "Distributor",
                "Editor",
                "HostingInstitution",
                "Producer",
                "ProjectLeader",
                "ProjectManager",
                "ProjectMember",
                "RegistrationAgency",
                "RegistrationAuthority",
                "RelatedPerson",
                "Researcher",
                "ResearchGroup",
                "RightsHolder",
                "Sponsor",
                "Supervisor",
                "WorkPackageLeader",
                "Other"
            ]
        },
        "date": {
            "type": "string",
            "anyOf": [
                {"format": "date"},
                {"format": "date-time"}
            ]
        },
        "dateType": {
            "type": "string",
            "enum": [
                "Accepted",
                "Available",
                "Copyrighted",
                "Collected",
                "Created",
                "Issued",
                "Submitted",
                "Updated",
                "Valid",
                "Withdrawn",
                "Other"
            ]
        },
        "resourceTypeGeneral": {
            "type": "string",
            "enum": [
                "Audiovisual",
                "Collection",
                "DataPaper",
                "Dataset",
                "Event",
                "Image",
                "InteractiveResource",
                "Model",
                "PhysicalObject",
                "Service",
                "Software",
                "Sound",
                "Text",
                "Workflow",
                "Other"
            ]
        },
        "relatedIdentifierType": {
            "type": "string",
            "enum": [
                "ARK",
                "arXiv",
                "bibcode",
                "DOI",
                "EAN13",
                "EISSN",
                "Handle",
                "IGSN",
                "ISBN",
                "ISSN",
                "ISTC",
                "LISSN",
                "LSID",
                "PMID",
                "PURL",
                "UPC",
                "URL",
                "URN",
                "w3id"
            ]
        },
        "relationType": {
            "type": "string",
            "enum": [
                "IsCitedBy",
                "Cites",
                "IsSupplementTo",
                "IsSupplementedBy",
                "IsContinuedBy",
                "Continues",
                "IsDescribedBy",
                "Describes",
                "HasMetadata",
                "IsMetadataFor",
                "HasVersion",
                "IsVersionOf",
                "IsNewVersionOf",
                "IsPreviousVersionOf",
                "IsPartOf",
                "HasPart",
                "IsReferencedBy",
                "References",
                "IsDocumentedBy",
                "Documents",
                "IsCompiledBy",
                "Compiles",
                "IsVariantFormOf",
                "IsOriginalFormOf",
                "IsIdenticalTo",
                "IsReviewedBy",
                "Reviews",
                "IsDerivedFrom",
                "IsSourceOf",
                "IsRequiredBy",
                "Requires",
                "IsObsoletedBy",
                "Obsoletes"
            ]
        },
        "descriptionType": {
            "type": "string",
            "enum": [
                "Abstract",
                "Methods",
                "SeriesInformation",
                "TableOfContents",
                "TechnicalInfo",
                "Other"
            ]
        },
        "geoLocationPoint": {
            "type": "object",
            "properties": {
                "pointLongitude": {"$ref": "#/definitions/longitude"},
                "pointLatitude": {"$ref": "#/definitions/latitude"}
            },
            "required": ["pointLongitude", "pointLatitude"]
        },
        "longitude": {
            "type": "number",
            "minimum": -180,
            "maximum": 180
        },
        "latitude": {
            "type": "number",
            "minimum": -90,
            "maximum": 90
        },
        "funderIdentifierType": {
            "type": "string",
            "enum": [
                "ISNI",
                "GRID",
                "Crossref Funder ID",
                "Other"
            ]
        }
    },

    "type": "object",

    "properties": {
        "types": {
            "type": "object",
            "properties": {
                "resourceType": {"type": "string"},
                "resourceTypeGeneral": {"$ref": "#/definitions/resourceTypeGeneral"}
            },
            "required": ["resourceType", "resourceTypeGeneral"]
        },
        "identifiers": {
            "type": "array",
            "items":{
                "type": "object",
                "properties": {
                    "identifier": {"type": "string"},
                    "identifierType": {"type": "string"}
                },
                "required": ["identifier", "identifierType"]
            },
            "minItems": 1,
            "uniqueItems": true
        },
        "creators": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "nameType": {"$ref": "#/definitions/nameType"},
                    "givenName": {"type": "string"},
                    "familyName": {"type": "string"},
                    "nameIdentifiers": {"$ref": "#/definitions/nameIdentifiers"},
                    "affiliations": {"$ref": "#/definitions/affiliations"},
                    "lang": {"type": "string"}
                },
                "required": ["name"]
            },
            "minItems": 1,
            "uniqueItems": true
        },
        "titles": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "title": {"type": "string"},
                    "titleType": {"$ref": "#/definitions/titleType"},
                    "lang": {"type": "string"}
                },
                "required": ["title"]
            },
            "minItems": 1,
            "uniqueItems": true
        },
        "publisher": {
            "type": "string"
        },
        "publicationYear": {
            "type": "string"
        },
        "subjects": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "subject": {"type": "string"},
                    "subjectScheme": {"type": "string"},
                    "schemeURI": {"type": "string", "format": "uri"},
                    "valueURI": {"type": "string", "format": "uri"},
                    "lang": {"type": "string"}
                },
                "required": ["subject"]
            },
            "uniqueItems": true
        },
        "contributors": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "contributorType": {"$ref": "#/definitions/contributorType"},
                    "name": {"type": "string"},
                    "nameType": {"$ref": "#/definitions/nameType"},
                    "givenName": {"type": "string"},
                    "familyName": {"type": "string"},
                    "nameIdentifiers": {"$ref": "#/definitions/nameIdentifiers"},
                    "affiliations": {"$ref": "#/definitions/affiliations"},
                    "lang": {"type": "string"}
                },
                "required": ["contributorType", "name"]
            },
            "uniqueItems": true
        },
        "dates": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "date": {"$ref": "#/definitions/date"},
                    "dateType": {"$ref": "#/definitions/dateType"},
                    "dateInformation": {"type": "string"}
                },
                "required": ["date", "dateType"]
            },
            "uniqueItems": true
        },
        "language": {
            "type": "string",
            "$comment": "Primary language of the resource. Allowed values are taken from  IETF BCP 47, ISO 639-1 language codes."
        },
        "alternateIdentifiers": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "alternateIdentifier": {"type": "string"},
                    "alternateIdentifierType": {"type": "string"}
                },
                "required": ["alternateIdentifier", "alternateIdentifierType"]
            },
            "uniqueItems": true
        },
        "relatedIdentifiers": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "relatedIdentifier": {"type": "string"},
                    "relatedIdentifierType": {"$ref": "#/definitions/relatedIdentifierType"},
                    "relationType": {"$ref": "#/definitions/relationType"},
                    "relatedMetadataScheme": {"type": "string"},
                    "schemeURI": {"type": "string", "format": "uri"},
                    "schemeType": {"type": "string"},
                    "resourceTypeGeneral": {"$ref": "#/definitions/resourceTypeGeneral"}
                },
                "required": ["relatedIdentifier", "relatedIdentifierType", "relationType"],
                "if": {
                    "properties": {
                        "relationType": {"enum": ["HasMetadata", "IsMetadataFor"]}
                    }
                },
                "else": {
                    "$comment": "these properties may only be used with relation types HasMetadata/IsMetadataFor",
                    "properties": {
                        "relatedMetadataScheme": false,
                        "schemeURI": false,
                        "schemeType": false
                    }
                }
            },
            "uniqueItems": true
        },
        "sizes": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "uniqueItems": true
        },
        "formats": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "uniqueItems": true
        },
        "version": {
            "type": "string"
        },
        "rightsList": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "rights": {"type": "string"},
                    "rightsURI": {"type": "string", "format": "uri"},
                    "rightsIdentifier": {"type": "string"},
                    "rightsIdentifierScheme": {"type": "string"},
                    "schemeURI": {"type": "string", "format": "uri"},
                    "lang": {"type": "string"}
                }
            },
            "uniqueItems": true
        },
        "descriptions": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "description": {"type": "string"},
                    "descriptionType": {"$ref": "#/definitions/descriptionType"},
                    "lang": {"type": "string"}
                },
                "required": ["description", "descriptionType"]
            },
            "uniqueItems": true
        },
        "geoLocations": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "geoLocationPlace": {"type": "string"},
                    "geoLocationPoint": {"$ref": "#/definitions/geoLocationPoint"},
                    "geoLocationBox": {
                        "type": "object",
                        "properties": {
                            "westBoundLongitude": {"$ref": "#/definitions/longitude"},
                            "eastBoundLongitude": {"$ref": "#/definitions/longitude"},
                            "southBoundLatitude": {"$ref": "#/definitions/latitude"},
                            "northBoundLatitude": {"$ref": "#/definitions/latitude"}
                        },
                        "required": ["westBoundLongitude", "eastBoundLongitude", "southBoundLatitude", "northBoundLatitude"]
                    },
                    "geoLocationPolygons": {
                        "type": "array",
                        "items": {
                            "type": "object",
                            "properties": {
                                "polygonPoints": {
                                    "type": "array",
                                    "items": {"$ref": "#/definitions/geoLocationPoint"},
                                    "minItems": 4
                                },
                                "inPolygonPoint": {"$ref": "#/definitions/geoLocationPoint"}
                            },
                            "required": ["polygonPoints"]
                        },
                        "uniqueItems": true
                    }
                }
            },
            "uniqueItems": true
        },
        "fundingReferences": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "funderName": {"type": "string"},
                    "funderIdentifier": {"type": "string"},
                    "funderIdentifierType": {"$ref": "#/definitions/funderIdentifierType"},
                    "awardNumber": {"type": "string"},
                    "awardURI": {"type": "string", "format": "uri"},
                    "awardTitle": {"type": "string"}
                },
                "required": ["funderName"]
            },
            "uniqueItems": true
        },
        "schemaVersion": {
            "type": "string",
            "const": "http://datacite.org/schema/kernel-4"
        }
    },
    "additionalProperties": false
}