identifier

http://schema.org/identifier
http://www.w3.org/1999/02/22-rdf-syntax-ns#Property
http://purl.org/dc/terms/identifier
http://schema.org/PropertyValue
http://schema.org/Text
http://schema.org/URL
http://schema.org/Thing
The identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See background notes for more details.
identifier