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The CIDOC Conceptual Reference Model (CRM) provides an extensible ontology for concepts and information in cultural heritage and museum documentation. It is the international standard (ISO 21127:2014) for the controlled exchange of cultural heritage information.[1] Galleries, libraries, archives, museums (GLAMs), and other cultural institutions are encouraged to use the CIDOC CRM to enhance accessibility to museum-related information and knowledge.

By adopting formal semantics for the CIDOC CRM, the pre-conditions for machine-to-machine interoperability and integration have been established. Thus, CIDOC CRM is well placed to become an important information standard and reference model for Semantic Web initiatives, and serves as a guide for data, or database, modeling more generally. Technically speaking, CIDOC CRM lends itself to software applications that extensively use XML and RDF.[4] Many cultural heritage institutions are investigating or building applications that use CIDOC CRM.[5]

Following th

Following the successful standardization of the CIDOC CRM, a new initiative, FRBRoo, was begun in 2006 to harmonize it with the Functional Requirements for Bibliographic Records (FRBR). The aim of this initiative is to "provide a formal ontology intended to capture and represent the underlying semantics of bibliographic information and to facilitate the integration, mediation, and interchange of bibliographic and museum information."[6][7]

The "CIDOC object-oriented Conceptual Reference Model" (CRM) is a domain ontology, but includes its own version of an upper ontology.

The core classes cover:[8]

Space-Time
includes title/identifier, place, era/period, time-span, and relationship to persistent items
Events
includes title/identifier, beginning/ending of existence, par

The core classes cover:[8]

Examples of definitions:[9]

Persistent Item
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 Persistent Item is comparable to an endurant.
Temporal Entity
includes events, eras/periods, and condition states which happen over a limited extent in time, and is disjoint with Persistent Item. A Temporal Entity is comparable to a perdurant.
Propositional Object
a set of statements about r
Normal Exit PeriodicService.php