> PropertyitemFormat

Property : cld:itemFormat

This document is part of the [Self]DCMI Collection Description Working Group Wiki.

IMPORTANT: Do not cite materials in this Wiki other than for the purposes of collaborating on document creation. This Wiki is intended to be used to work on draft copies of documents. Finished documents will be published, in a persistent and citable form, on the dublincore.org Web site (or elsewhere in some cases).

This is a draft document, currently being worked on by the [WWW]DCMI Collection Description Working Group. Comments should be sent to the DC-COLLECTIONS@jiscmail.ac.uk mailing list or direct to the authors.

Title: Property : cld:itemFormat
Creator: DCMI Collection Description Working Group
Date Issued: 2006-06-08
Identifier: http://dublincore.org/collectionwiki/PropertyitemFormat
Replaces: Not applicable
Is Replaced By: Not applicable
Latest Version: http://dublincore.org/collectionwiki/PropertyitemFormat
Description of Document: This document describes a new property, cld:itemFormat.

Description of Property

Term URI: http://example.org/cld/terms#itemFormat
Qualified Name: cld:itemFormat
Defined By: Collection Description Terms http://example.org/cld/terms
Type of Term: Property
Domain: dcmitype:Collection, DCMI Type Vocabulary, http://purl.org/dc/dcmitype/Collection
Range: gen:MediaType, General Description Terms http://example.org/gen/terms#MediaType
SubProperty Of:
Has SubProperty:
Has Inverse Property:
Label: Item Format
Definition: A media type of one or more items within the collection.
Comment: The value of this property is a media type i.e. a digital file format or a physical medium.

Examples

@prefix coll: <http://example.org/colls/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix cld: <http://example.org/cld/terms#> .
DescriptionSet (
  Description (
    ResourceURI ( coll:c1234 )
    Statement (
      PropertyURI ( dc:title )
      ValueString ( "My Digital Image Collection"
        Language ( en-GB )
      )
    )
    Statement (
      PropertyURI ( cld:itemFormat )
      VocabularyEncodingSchemeURI ( dcterms:IMT )
      ValueString ( "image/tiff")
    )
    Statement (
      PropertyURI ( cld:itemFormat )
      VocabularyEncodingSchemeURI ( dcterms:IMT )
      ValueString ( "image/jpeg")
    )
  )
)

@prefix coll: <http://example.org/colls/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix cld: <http://example.org/cld/terms#> .
@prefix other: <http://example.org/classes/> .
DescriptionSet (
  Description (
    ResourceURI ( coll:c5678 )
    Statement (
      PropertyURI ( dc:title )
      ValueString ( "My Art Collection"
        Language ( en-GB )
      )
    )
    Statement (
      PropertyURI ( cld:itemFormat )
      VocabularyEncodingSchemeURI ( other:PhysicalMedium )
      ValueString ( "oil on canvass")
    )
    Statement (
      PropertyURI ( cld:itemFormat )
      VocabularyEncodingSchemeURI ( other:PhysicalMedium )
      ValueString ( "ink on paper")
    )
  )
)

Supporting Information

Why Needed: It is a functional requirement that the DC CD AP should allow applications to search for collections that include items of a specified media type and/or to group lists of collections according to the media type of items within the collection.

The existing dc:format property does not meet the requirement, because it is not the media type of the collection that is to be captured, but that of items within the collection. Attempting to use the dc:format property for this purpose could result in a description asserting that the collection - a single resource, an aggregation of items - itself has a media-type of both "audio/wav" and "audio/mp3", which an application may interpret as contradictory.

The proposal does not infringe the "one-to-one" rule because it is not seeking to capture the media-type of some specific item; it is based on treating the fact that a collection includes some (unspecified) items of a named media-type as an attribute of the collection.
Related DCMI Terms: The DCMI property dc:format takes as its value the media type or dimensions of the subject resource.
Related non-DCMI Terms:
About the Proposers: The term is proposed by the [WWW]Dublin Core Collection Description Working Group. One of the primary aims of the WG is the development of a Dublin Core Application Profile (DCAP) for collection-level description, i.e. for the description of a collection as a resource, rather than the description of the individual items that make up that collection. Records of the activity of the WG are available in the [WWW]mailing list archives. The current draft of the Collection Description Application Profile is available at http://dublincore.org/groups/collections/collection-application-profile/

Notes

1. A class of MediaType is amongst the classes proposed by the DCMI Usage Board as part of their work to assign ranges and domains to the DCMI properties.