Collection¶
PCDM defines its own class for collections: pcdm:Collection. A Collection is a group of resources that have
descriptive metadata, access metadata, and may link to works and/or collections. By default, member works and
collections are an unordered set, but can be ordered using the ORE Proxy class.
Minimum Model¶
A simple Collection instance may have many more properties, but should look something like this:
@prefix ex: <http://example.org/> .
@prefix pcdm: <http://pcdm.org/models#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
ex:Collection a pcdm:Collection ;
dc:title "My Image Collection" ;
pcdm:hasMember ex:ImageOne, ex:ImageTwo, ex:ImageThree, ex:ImageFour .
Rules and Guidelines¶
A Collection MUST:
be an instance of
pcdm:Collectionvia therdf:typeproperty.be related to parent Collections or child works via
pcdm:memberOforpcdm:hasMemberproperties.have mandatory descriptive elements as stated by Metadata Guidelines for Digital Resources at Texas A&M University Libraries
A Collection MAY:
have other descriptive metadata properties.
have many objects or filesets.
have proxies if the works in the collection require order.
A Collection MUST NOT:
contain child files directly.
Real World Examples¶
An Unordered Collection with many Works¶
Here is a very basic collection:
@prefix ex: <http://example.org/> .
@prefix pcdm: <http://pcdm.org/models#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
ex:Collection a pcdm:Collection ;
dc:title "Image Collection" ;
pcdm:hasMember ex:ImageOne, ex:ImageTwo, ex:ImageThree, ex:ImageFour .
ex:ImageOne a pcdmworks:Work ;
dc:title "A Map" ;
dc:rights <http://rightsstatements.org/vocab/InC-EDU/1.0/> ;
dc:format "reformatted digital" ;
dc:type "StillImage", "Text" ;
dc:publisher "Texas A & M University. Libraries" ;
pcdm:memberOf ex:Collection ;
pcdm:hasMember ex:MapFront, ex:MapBack ;
pcdm:hasFile ex:GISDataSet .
ex:ImageTwo a pcdmworks:Work ;
dc:title "A Picture of a Cat" ;
dc:rights <http://rightsstatements.org/vocab/InC-EDU/1.0/> ;
dc:format "reformatted digital" ;
dc:type "StillImage", "Text" ;
dc:publisher "Texas A & M University. Libraries" ;
pcdm:memberOf ex:Collection ;
pcdm:hasMember ex:TheActualImage ;