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:

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 ;

A Collection with Many Works and an Attached FileSet

An Ordered Collection

A Collection with No Works But Many Collections