DataModel

数据模型定义了知识图谱服务中的实体类型和关系类型以及一些附加设置。DataModel 资源允许用户查询实体和关系类型的属性。通过定义这些类型及其属性，数据模型定义了图谱的模式。

知识图谱数据模型示例。

{
 "dataModel": {
   "declaredClass": "geoscene.rest.knowledgeGraph.DataModel",
   "timestamp": {},
   "spatialReference": {
     "latestWkid": 0,
     "wkid": 4326,
     "vcsWkid": 0,
     "latestVcsWkid": 0
   },
   "strict": false,
   "entityTypes": [
     {
       "declaredClass": "geoscene.rest.knowledgeGraph.EntityType",
       "name": "company",
       "alias": "Company",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.GraphProperty",
           "name": "Name",
           "alias": "Name",
           "fieldType": "esriFieldTypeString",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": true,
           "editable": true,
           "required": false,
           "defaultVisibility": true,
           "systemMaintained": false,
           "searchable": false,
           "defaultValue": null
         },
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.GraphProperty",
           "name": "id",
           "alias": "id",
           "fieldType": "esriFieldTypeOID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": true,
           "searchable": false,
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.FieldIndex",
           "name": "esri__id_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "id"
           ]
         },
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.FieldIndex",
           "name": "geoscene__name_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "name"
           ]
         }
       ]
     }
   ],
   "relationshipTypes": [
     {
       "declaredClass": "geoscene.rest.knowledgeGraph.RelationshipType",
       "name": "employed_bu",
       "alias": "Employed By",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.GraphProperty",
           "name": "id",
           "alias": "id",
           "fieldType": "esriFieldTypeGUID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": true,
           "searchable": false,
           "defaultValue": null
         },
         {
           "declaredClass": "geoscene.rest.knowledgeGraph.GraphProperty",
           "name": "start_date",
           "alias": "Start Date",
           "fieldType": "esriFieldTypeDate",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": false,
           "searchable": false,
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
            {
            "ascending": true,
            "description": "index on id field",
            "fieldNames": ["id"],
            "name": "esri_id_idx",
            "unique": "true",
          }
       ],
       "originEntityTypes": [
         "Person"
       ],
       "destinationEntityTypes": [
         "Company"
       ]
     }
   ]
 }
}