<https://schema.org/identifier>
<http://www.w3.org/2000/01/rdf-schema#comment>
"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](/docs/datamodel.html#identifierBg) for more details.\n        "
<https://www.schema.org/LocationFeatureSpecification>