4.7.  Date                              Label: "Date"

   A date associated with the creation or availability of the resource.
   Recommended best practice is defined in a profile of ISO 8601 [3]
   that includes (among others) dates of the forms YYYY and YYYY-MM-DD.
   In this scheme, for example, the date 1994-11-05 corresponds to
   November 5, 1994.

4.8.  Resource Type                     Label: "Type"

   The category of the resource, such as home page, novel, poem, working
   paper, technical report, essay, dictionary.  For the sake of
   interoperability, Type should be selected from an enumerated list
   that is currently under development in the workshop series.

4.9.  Format                            Label: "Format"

   The data format and, optionally, dimensions (e.g., size, duration) of
   the resource.  The format is used to identify the software and
   possibly hardware that might be needed to display or operate the





 
RFC 2413      Dublin Core Metadata for Resource Discovery September 1998


   resource.  For the sake of interoperability, the format should be
   selected from an enumerated list that is currently under development
   in the workshop series.

4.10. Resource Identifier               Label: "Identifier"

   A string or number used to uniquely identify the resource.  Examples
   for networked resources include URLs and URNs (when implemented).
   Other globally-unique identifiers, such as International Standard
   Book Numbers (ISBN) or other formal names are also candidates for
   this element.

4.11. Source                            Label: "Source"

   Information about a second resource from which the present resource
   is derived.  While it is generally recommended that elements contain
   information about the present resource only, this element may contain
   metadata for the second resource when it is considered important for
   discovery of the present resource.

4.12. Language                          Label: "Language"

   The language of the intellectual content of the resource.
   Recommended best practice is defined in RFC 1766 [4].

4.13. Relation                          Label: "Relation"

   An identifier of a second resource and its relationship to the
   present resource.  This element is used to express linkages among
   related resources.  For the sake of interoperability, relationships
   should be selected from an enumerated list that is currently under
   development in the workshop series.

4.14. Coverage                          Label: "Coverage"

   The spatial or temporal characteristics of the intellectual content
   of the resource.  Spatial coverage refers to a physical region (e.g.,
   celestial sector) using place names or coordinates (e.g., longitude
   and latitude).  Temporal coverage refers to what the resource is
   about rather than when it was created or made available (the latter
   belonging in the Date element).  Temporal coverage is typically
   specified using named time periods (e.g., neolithic) or the same
   date/time format [3] as recommended for the Date element.









 
RFC 2413      Dublin Core Metadata for Resource Discovery September 1998


4.15. Rights Management                 Label: "Rights"

   A rights management statement, an identifier that links to a rights
   management statement, or an identifier that links to a service
   providing information about rights management for the resource.

5. Security Considerations

   The Dublin Core element set poses no risk to computers and networks.
   It poses minimal risk to searchers who obtain incorrect or private
   information due to careless mapping from rich data descriptions to
   the simple Dublin Core scheme.  No other security concerns are likely
   to be raised by the element description consensus documented here.