API Reference > imodeljs-backend > ElementAspects > ExternalSourceAspect ExternalSourceAspect Class An ElementMultiAspect that stores synchronization information for an Element originating from an external source. note The associated ECClass was added to the BisCore schema in version 1.0.2 Extends ElementMultiAspect Implements EntityProps ElementAspectProps ExternalSourceAspectProps Inherited methods Name Inherited from Description forEachProperty(func: PropertyCallback, includeCustom: boolean = false): void Entity Call a function for each property of this Entity. onDelete(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called before an ElementAspect is deleted. onDeleted(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called after an ElementAspect was deleted. onInsert(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called before a new ElementAspect is inserted. onInserted(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called after a new ElementAspect was inserted. onUpdate(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called before an ElementAspect is updated. onUpdated(_props: ElementAspectProps, _iModel: IModelDb): void ProtectedStatic ElementAspect Called after an ElementAspect was updated. Properties Name Type Description checksum undefined | string The cryptographic hash (any algorithm) of the source object's content. identifier string The identifier of the object in the source repository. jsonProperties undefined | string A place where additional JSON properties can be stored. kind string The kind of object within the source repository. scope RelatedElement An element that scopes the combination of kind and identifier to uniquely identify the object from the external source. version undefined | string An optional value that is typically a version number or a pseudo version number like last modified time. Inherited properties Name Type Inherited from Description classFullName Accessor ReadOnly string Entity Get the full BIS class name of this Entity in the form "schema:class". classFullName Accessor StaticReadOnly string Entity Get the full BIS class name of this Entity in the form "schema:class" className Accessor ReadOnly string Entity The name of the BIS class associated with this class. element RelatedElement ElementAspect id Id64String Entity The Id of this Entity. iModel IModelDb Entity The IModelDb that contains this Entity schema Static undefined Entity The Schema that defines this class. schemaName Accessor ReadOnly string Entity The name of the BIS Schema that defines this class Defined in core/backend/src/ElementAspect.ts Line 88 Last Updated: 13 June, 2024