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Element
| A data Element. This is the top level term in the PCS Data Dictionary, to which all other terms (Elements) are hierarchically linked. An Element can be of any size or granularity, from a single data value to a Message or suite of Messages. |
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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. |
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Creation
| An entity that is made, directly or indirectly, by one or more human beings. |
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Descriptor
| A textual attribute of another entity, which may function as a Name or Annotation or both. |
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Party
| A human or other animal being (real or imaginary), a legal person or an organization capable of playing a role as an agent in an Event. Party includes non-human and imaginary "beings" (for example "Mickey Mouse" or "Lassie") because these may be credited with Contributor or other roles. |
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Relator
| An entity that describes the relationship between two other entities (Examples: "IsSubClassOf", "IsA" or "IsPartOf"). Relators are not normally used directly in PCS Messages: Relators are Dictionary linking elements (or "ontological elements") which are used to create all of the links which hold the Dictionary structure together. For example, a relationship such as "DealerPrice IsSubClassOf Price" results in a parent-child link being established between "Price" and "DealerPrice". Each Relator has a reverse or "reciprocal" Relator which is used to describe the same Relationship from the reverse point of view. For example, "HasSubClass" is the reverse Relator of "IsSubClassOf", and so a statement such as "Price HasSubClass DealerPrice" has the same meaning as "DealerPrice IsSubClassOf Price". This enables the Dictionary to be navigated in all directions. Some Relators (for example, "IsSameAs") are used for describing a Relationship in both directions and so are their own reciprocals. |
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Set
| A set of one or more entities. |