The use of types in FRBRoo

CIDOC-CRM introduces the concept of Type in order to categorize the instances of all concepts.
CRM’s class E55 Type comprises concepts denoted by terms from thesauri, controlled vocabularies and other KOS used to characterize and classify instances of CRM classes into more detailed categories. Instances of E55 Type represent concepts (classes).That is why E55 Type and any of its subclasses is characterized as a metaclass.

Any CRM entity (with the exception of E59 Primitive value) can be further specialized and can be regarded as instance of E55 Type, inheriting the property P2 has type (is type of). 
FRBRoo inherits the concept of E55 type, which gives the possibility to provide a general mechanism for refining  the classification of all FRBRoo instances to any level of detail, by linking to external vocabulary sources, thesauri, classification schemas or ontologies.
 

 

In the example of the picture we can see some of the types that are recorded in the case of a documentation a picture which represents a scene of an opera performance. The type of actor who created the image is the photographer and the type of image he created is a photograph. The instance of the E39 Actor who participates in the particular scene has the type “baritone”. This performance performs a performance plan created by an instance of a E39 Actor with the type “stage director”. All these instances of E55 Type are concepts, they are classes themselves.

As already seen, FRBRoo introduced F3 Manifestation Product Type, as a subclass of E55 Type.
F3 Manifestation product type is a metaclass because it can be instantiated and take values such as “product with ISBN: 969-86830-0-9”  which is itself a class since it is a category of items that share the same characteristics which serve as criteria to identify the items belonging to this class.
More concretely it characterizes the “edition” which consists of  “n” individual copies that can be recognized to be the outcome of the same process of production.
The individual copies (instances of F5 Item) 1, 2, 3,…,n are seen  as instances of this particular edition.

F5 Item is a generalization of the “product type with ISBN 969-86830-0-9” . This means that the last one inherits the property “P57 has number of parts from F5 Item  which itself inherits this property from its superclass, the E19 Physical object.
The “product with ISBN: 969-86830-0-9”  should consist of 2 parts. Consequently every instance of this product, every individual copy,  consists of 2 parts.

 

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