API Reference > imodeljs-backend > ElementAspects ElementAspects Subclasses of ElementAspects. See the learning articles. Classes Name Description ElementAspect An Element Aspect is a class that defines a set of properties that are related to (and owned by) a single element. ElementMultiAspect An Element Multi-Aspect is an ElementAspect where there can be n instances of the Element Aspect class per Element. ElementUniqueAspect An Element Unique Aspect is an ElementAspect where there can be only zero or one instance of the Element Aspect class per Element. ExternalSourceAspect An ElementMultiAspect that stores synchronization information for an Element originating from an external source. Enumerations Name Description ExternalSourceAspect.Kind Standard values for the Kind property of ExternalSourceAspect. Last Updated: 13 June, 2024