KnowledgeGraph | References | ArcGIS Maps SDK for JavaScript

import KnowledgeGraph from "@arcgis/core/rest/knowledgeGraph/KnowledgeGraph.js";

Inheritance:: KnowledgeGraph→Accessor

Since: ArcGIS Maps SDK for JavaScript 4.25

The knowledge graph associated with the knowledgeGraphService. This is a graph database that stores entities and relationships.

See also

fetchKnowledgeGraph()
Hosted Knowledge Graph Service for information on the structure knowledge graph services on ArcGIS Enterprise and the REST API

Examples

//fetch the knowledge graph
const KnowledgeGraphModule = await $arcgis.import("@arcgis/core/rest/knowledgeGraphService.js");
const url = "https://<web server hostname>/server/rest/admin/services/<serviceName>/KnowledgeGraphServer";
KnowledgeGraphModule.fetchKnowledgeGraph(url)
 .then((kg) => {
    //do something with result
   console.log(kg)
});

//sample result returned from fetchKnowledgeGraph()
{
 "url":"https://myHostName.domain.com/arcgis/rest/services/Hosted/myServiceName/KnowledgeGraphServer"
 {
 "dataModel": {
   "declaredClass": "esri.rest.knowledgeGraph.DataModel",
   "timestamp": {},
   "spatialReference": {
     "latestWkid": 0,
     "wkid": 4326,
     "vcsWkid": 0,
     "latestVcsWkid": 0
   },
   "strict": false,
   "entityTypes": [
     {
       "declaredClass": "esri.rest.knowledgeGraph.EntityType",
       "name": "company",
       "alias": "Company",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "esri.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,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         },
         {
           "declaredClass": "esri.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,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
         {
           "declaredClass": "esri.rest.knowledgeGraph.FieldIndex",
           "name": "esri__id_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "id"
           ]
         },
         {
           "declaredClass": "esri.rest.knowledgeGraph.FieldIndex",
           "name": "esri__name_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "name"
           ]
         }
       ]
     }
   ],
   "relationshipTypes": [
     {
       "declaredClass": "esri.rest.knowledgeGraph.RelationshipType",
       "name": "employed_bu",
       "alias": "Employed By",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "esri.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,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         },
         {
           "declaredClass": "esri.rest.knowledgeGraph.GraphProperty",
           "name": "start_date",
           "alias": "Start Date",
           "fieldType": "esriFieldTypeGUID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": false,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
            {
            "ascending": true,
            "description": "index on id field",
            "fieldNames": ["id"],
            "name": "esri_id_idx",
            "unique": "true",
          }
       ],
       "originEntityTypes": [
         "Person"
       ],
       "destinationEntityTypes": [
         "Company"
       ]
     }
   ]
  }
 }
}

Constructors

Constructor

Parameters

Parameter	Type	Description	Required
properties	`KnowledgeGraphProperties`

See the properties table for a list of all the properties that may be passed into the constructor.

Properties

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Property	Type	Class
`dataModel` readonly	`DataModel`
`declaredClass` readonly inherited	`string`	Accessor
`serviceDefinition` readonly	`ServiceDefinition`
`url`	`string`

dataModel

readonly Property

Type: DataModel

The data model of the knowledge graph service. The data model defines the types of entities and relationships that can exist in the knowledge graph and the properties that can exist for each type of entity and relationship.

declaredClass

readonlyinherited Property

Type: string

Inherited from: Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

serviceDefinition

readonly Property

Type: ServiceDefinition

The service definition of the knowledge graph service. The service definition outlines the capabilities of the knowledge graph such as search indexes, operations allowed etc.

url

Property

Type: string

The url to a hosted knowledge graph. See ArcGIS Hosted Knowledge Graph for more information on knowledge graph services.

Methods

Method	Signature	Class
`fromJSON` inherited static	`fromJSON(json: any): any`	JSONSupportMixin
`toJSON` inherited	`toJSON(): any`	JSONSupportMixin

fromJSON

inheritedstatic Method

Signature: fromJSON (json: any): any

Inherited from: JSONSupportMixin

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameters

Parameter	Type	Description	Required
json	`any`	A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns: any
Returns a new instance of this class.

toJSON

inherited Method

Signature: toJSON (): any

Inherited from: JSONSupportMixin

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns: any
The ArcGIS portal JSON representation of an instance of this class.