A named tag on a Thing. about → the tagged resource; object → optional more specific referent (e.g. a snapshot Action). Does not copy or materialise the resource state.

Root system Thing: project subclass of schema.org/Thing used as fallback value type and generic object category.

A user account represented as a person-like actor with credential and account status metadata.

An authentication credential for a local user account, such as an OAuth provider identity.

A named schema vocabulary (namespace) that groups Classes, Properties, Enumerations, Enummembers, and Objects. Subclass of schema.org/CreativeWork.

System WebSite: site configuration for a domain (name, branding, settings).