API Reference > imodeljs-common > Entities Entities Definitions of the "props" interfaces and types that define the wire format for communication between the frontend and backend about entities (models, elements, etc) contained in an iModel. Classes Name Description EntityMetaData Metadata for an Entity. Beta PropertyMetaData Metadata for a property. Beta RelatedElement The Id and relationship class of an Element that is somehow related to another Element TypeDefinition A RelatedElement relationship that describes the TypeDefinitionElement of an element. Enumerations Name Description ExternalSourceAttachmentRole The role that an attached ExternalSource plays. Beta PrimitiveTypeCode The primitive types of an Entity property. Beta Rank The rank for a Category SectionType An enumeration of the different types of SectionDrawings. TypeOfChange Bitflags describing which aspects of an Element changed as part of a ChangedElements. Global Functions Name Description isPlacement2dProps determine if this is Placement2dProps isPlacement3dProps determine if this is Placement3dProps Interfaces Name Description CalloutProps CategoryProps Parameters of a Category ChangedElements Changed elements found in a changeset or between a range of changesets. ChannelRootAspectProps Properties of an ChannelRootAspect that identifies an Element as the root of a channel which is a subset of the overall iModel hierarchy that is independently maintained. CustomAttribute A custom attribute instance Beta DefinitionElementProps Properties of a DefinitionElement DisplayStyleLoadProps Options controlling which properties are included or excluded when querying DisplayStyleProps. ElementAspectProps Properties of an ElementAspect ElementLoadOptions Options used to specify properties to include or exclude when querying ElementLoadOptions.ElementProps with functions like ElementLoadProps Parameters to specify what element to load for functions like IModelDb.Elements.getElementProps. ElementProps Properties of an Element EntityMetaDataProps Beta EntityProps The properties of an Entity as they are read/stored from/to the iModel. EntityQueryParams Parameters for performing a query on Entity classes. ExternalSourceAspectProps Properties of an ExternalSourceAspect that stores synchronization information for an element originating from an external source. ExternalSourceAttachmentProps Properties of an ExternalSourceAttachment Beta ExternalSourceProps Properties of an ExternalSource Beta FunctionalElementProps GeometricElement2dProps Properties that define a GeometricElement2d GeometricElement3dProps Properties that define a GeometricElement3d GeometricElementProps Properties of a GeometricElement GeometricModel2dProps Properties that define a GeometricModel2d GeometricModel3dProps Properties that define a GeometricModel3d GeometricModelProps Properties that describe a GeometricModel GeometryPartProps Properties of a GeometryPart InformationPartitionElementProps Properties of a InformationPartitionElement LineStyleProps Properties of a LineStyle ModelLoadProps Properties that specify what model should be loaded. ModelProps Properties that define a Model ModelQueryParams Parameters for performing a query on Model classes. PhysicalElementProps Properties that define a PhysicalElement PhysicalTypeProps Properties of a PhysicalType Placement2dProps Properties of a Placement2d Placement3dProps Properties of a Placement3d PropertyMetaDataProps Beta RelatedElementProps Properties of a NavigationProperty. RelationshipProps Properties that are common to all types of link table ECRelationships RenderTimelineLoadProps Options controlling which properties are included or excluded when querying RenderTimelineProps. RenderTimelineProps Wire format describing a RenderTimeline. RepositoryLinkProps Parameters of a RepositoryLink SectionDrawingLocationProps Properties that define a SectionDrawingLocation SectionDrawingProps Properties that define a SectionDrawing. SheetBorderTemplateProps Properties of a SheetBorderTemplate Beta SheetProps Properties of a Sheet. SheetTemplateProps Properties of a SheetTemplate Beta SourceAndTarget Specifies the source and target elements of a Relationship instance. SubCategoryProps Parameters of a SubCategory SubjectProps Properties of a Subject SynchronizationConfigLinkProps The properties of a SynchronizationConfigLink Beta TextureLoadProps Properties that specify what texture should be loaded and how it should be loaded. TextureProps Properties that define a Texture element. TypeDefinitionElementProps Properties of a TypeDefinitionElement UrlLinkProps Parameters of a UrlLink ViewAttachmentLabelProps ViewAttachmentProps Properties for a ViewAttachment Namespaces Name Description Base64EncodedString Represents an array of bytes encoded in base-64 with a prefix indicating the encoding, as persisted in an ECDb for properties of binary type. Type Aliases Name Description PlacementProps PropertyCallback A callback function to process properties of an Entity Beta Last Updated: 15 July, 2021