Simon puts it very well.
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> I suggest that the following is likely to satisfy
> the single-field requirement of DC-Simple, while
> still bearing a sensible affinity to the more
> structured form of the semantics which will be
> encoded in DC-Qualified.
>
> ------
>
> 4.3.13 RELATION
>
> The RELATION element indicates a link between
> the present resource and another resource.
> The relationship is fully specified by
> the indentity of the two resources and the
> nature of the relationship.
>
> Relationships between resources fall into a number
> of classes, such as parent-child, aggregations, etc.
> A list of types which accomodates most expected
> relationships is [here insert reference to a more
> detailed explanation based on the Relation WG report?]:
>
> IsPartOf
> HasPart
> IsVersionOf
> HasVersion
> IsFormatOf
> HasFormat
> References
> IsReferencedBy
> IsBasedOn
> IsBasisFor
> Requires
> IsRequiredBy
>
> The recommended method for expressing a relationship
> in unqualified DC is:
>
> IDENTIFIER = "unique identifer for the present resource"
> RELATION = "relationship-type; unique identifer for the related
> resource"
>
> where "relationship-type" is a token drawn from the list above.
> In the case where the DC metadata is embedded in
> the present resource, the value for IDENTIFIER is
> implied (ie the present resource).
> Examples illustrating this usage are:
>
> IDENTIFIER = "paper.html"
> RELATION = "IsFormatOf; paper.doc"
>
> IDENTIFIER = "Mt. Kosciusko"
> RELATION = "IsPartOf; Snowy Mountains in Australia"
>
> IDENTIFIER = "program.c"
> RELATION = "Requires; stdio.h"
>
> IDENTIFIER = "Peter Carey's novel Oscar and Lucinda"
> RELATION = "IsBasisFor; 1998 movie Oscar and Lucinda"
>
> (the casual form identifers used here for illustration
> would be replaced by more formal identifiers in practice
> - see IDENTIFIER).
> In qualified DC the two components given in RELATION
> here will be structured using sub-elements for easier
> automated processing.
> --
> __________________________________________________
> Dr Simon Cox - Australian Geodynamics Cooperative Research Centre
> CSIRO Exploration & Mining, PO Box 437, Nedlands, WA 6009 Australia
> T: +61 8 9389 8421 F: +61 8 9389 1906 [log in to unmask]
> http://www.ned.dem.csiro.au/SimonCox/
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