#pragma keywords meta-data, meta data, pattern, Pattern, @page@
= FRBR Relations ** =
== Context ==
When creating a data-model where many objects will be of the same work, (see [[GuidelinesForNewDatamodel/PatternLanguage/Audio Collection/Clasical Music|Clasical Music]]) the use of the FRBR model can aid the planning of object relations at the levels between the collection (see [[GuidelinesForNewDatamodel/PatternLanguage/Collections In General|Collections In General]]) and the file-object (see [[GuidelinesForNewDatamodel/PatternLanguage/File-Objects|file-objects]]).

{{attachment:FRBR_in_Fedora.png}}

== Description of pattern ==
'''When there is a multitude, especially of ''Expressions'', ''Manifestations'' and ''Item's'', of the work it can be very prudent to include a relation in the data-model to reflect this '''

== Problem description ==
There are certain types of item groups within the library where there are many representations of the same work, take for instance the 7th symphony by Beethoven, an attempt to illustrate this form of construction is shown below.


|| '''Work''' ''part of DOMS meta-data'' <<BR>> Beethovens 7th symphony||
|| '''Expression''' ''part of DOMS meta-data'' <<BR>> The musical work as performed by the Philadelphia Symphony Orchestra, conducted by Leopold Stokowski <<BR>> The musical work as performed by DR's Symfoniorkester <<BR>> The composer's notated music <<BR>> ||
|| '''Manifestation''' ''part of DOMS meta-data'' <<BR>> Recordings released on 78 rpm sound discs in 1948 by Tono <<BR>> Recordings released on cd's in 1992 by CBS Records <<BR>>     The musical work televised by DR in 1994 <<BR>>     The notes on Beethovens 7th symphony ||
|| '''Item''' ''fedora file-object and DOMS digitization meta-data'' <<BR>> The 78 rpm sound disc stored at the State and University Library with call-no.: SM 517748 <<BR>> The digital audio file derived from the cd released in 1992 by CBS Records <<BR>> The digital audio file derived from the 78 rpm sound discs released in 1948 by Tono  <<BR>> The digital video file derived from the concert televised in 1994 by DR ||

A Manifestation can have several fedora file-objects, for instance recordings from [[http://en.wikipedia.org/wiki/Phonograph_cylinder|Phonograph cylinders]] have been digitized, for some items, in multiple versions since the original playback speed is unknown.

Use the structure of the data to strengthen the data-model, consider combining one-to-one mappings into one structure in the design of the datamodel, for instance Van goghs painting [[http://upload.wikimedia.org/wikipedia/commons/4/46/Vincent_Willem_van_Gogh_127.jpg|Tournesols]] is one ''Work'' with one ''Expression'', but several ''Manifestations''(one painting+many photographs) and thus many ''Items'' allowing for ''Work'' and ''Expression'' to be combined into  one datastructure, this will most likely apply to many paintings
== Solution ==
'''Use the nature of the collection to influence the FRBR relations in order to maximize the uniqueness of each data-object in the DOMS'''

== Consider next ==
This Pattern will influence the pattens within the FRBR model namely the [[How_to_use_FRBR|FRBR Work]], [[How_to_use_FRBR|FRBR Expression]], [[How_to_use_FRBR|FRBR Manifestation]] and [[./How_to_use_FRBR|FRBR Item]], these should not be decided on before taking the "[[How_to_use_FRBR|How to use FRBR]]" document into account.


== References ==
[[How_to_use_FRBR]]