PCS Ontology v1.5.9, 2007-12-19

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Category

A type, quality or measurement of another entity. A Category may be expressed in a variety of forms: as A Flag ("True/False"), a Class (eg "DigitalResource"), an adjectival Quality (eg "BlackAndWhite"), a nounal Quality (eg "Audibility") or as a numeric Quantity (eg "4.33MB"). Often the same categorization can be represented in several different ways. Example: the statements "ResourceX is an AudioCreation" (Class), "ResourceX is Audible" (adjectival Quality), "ResourceX has Audibility (noun Quality)" and "ResourceX has AudibilityFlag=True" (Flag) would all mean the same thing.

Meaning Type Derived

Relationships
Parents	Resource	Something which plays a role in a Context but is not a Time or a Place: Resource is therefore the "catch-all" parent for other entities. Resources may be physical, digital or abstract concepts, and include the Products, Releases, Recordings, Works and other human-made Creations which are the objects of creative and commercial activity; but Resource also includes the people or organizations (Parties) who can act as agents, and all forms of tools and materials which may be used or referenced in the processes described within PCS.
Children	Aspect	A Class of intrinsic attributes. Examples: Color, Mode, Gender, Veracity.
	Characteristic	A qualitative or quantitative attribute of an entity.
	Class	A set of things which have particular attributes in common. Every entity is either a "Class" or an "Individual", and some may be both. For example, "SoundRecording" is the Class of all instances of SoundRecording. A Class may also be a member of another Class. For example, "SoundRecording" is a member of the Class of "CreationType".
	Flag	A Boolean flag: that is, an attribute whose allowed values are only "True" or "False" (with the possibility of "Unknown" or a null default).

Copyright © 2007, IFPI