* Immaterial Things – includes title/identifier, information objects (propositional or symbolic), conceptional things, and part-of relationships
Examples of definitions:<ref>{{cite web|title=Definition of the CIDOC Conceptual Reference Model, Version 5.0.4|url=http://www.cidoc-crm.org/html/5.0.4/cidoc-crm.html|publisher=[[CIDOC]]|date=November 2011}}</ref><br/>APersistent persistentItem item is– a physical or conceptional item that has a persistent identity recognized within the duration of its existence by its identification rather than by its continuity or by observation. A persistentPersistent itemItem is comparable to an [[Endurantism|endurant]].<br/>Temporal Entity – includes events, eras/periods, and condition states which happen over a limited extent in time, and is [[Disjoint sets|disjoint]] with Persistent Item. A propositionalTemporal objectEntity is comparable to a [[Perdurantism|perdurant]].<br/>Propositional Object – a set of statements about real or imaginary things.<br/>ASymbolic symbolicObject object is– a sign/symbol or an aggregation of signs/symbols.
