Re: Definition of ma:fragments and ma:namedFragments

2009/9/30 Bailer, Werner <werner.bailer@joanneum.at>

> Dear all,
>
> When working on the implementation of our mapping prototype we came across
> an issue with the definition of the ma:fragments and ma:namedFragments
> elements. My understanding was (and this is supported by the examples in the
> table) that both contain lists of identifiers conforming to the media
> fragment URI specification. I still think that this should be the case for
> ma:namedFragments, i.e. listing the defined name fragments for a resource.
>
> However, in some metadata standards it is possible to assign identifiers to
> fragments (e.g. shots), and during mapping it seems to make sense to keep
> the identifier of the fragment (which could be any URI), and in addition
> provide the ma:locator property for the fragment, which would really be a
> media fragment URI (e.g. the temporal fragment representing the shot). If we
> require the identifiers in ma_fragments to be media fragment URIs, we would
> implicitly force them to be the same as the locators for the fragments. The
> other option would be to use ma:relation instead of ma:fragments in this
> case, which is in my opinion not appropriate.
>
> To summarize: the current specification of the ma:fragments and
> ma:namedFragments properties is not very precise, it talks about fragment
> identifiers. I think that we should be clear whether we mean media fragment
> URI compliant ones or any URI. From the problem above it seems that it
> should be any URI for ma:fragments (which does of course not exclude media
> fragment URIs) and media fragment URIs for ma:namedFragments.
>


Sounds reasonable, though maybe we should rename ma:namedFragments to
ma:namedMediaFragments.

Felix




>
> Best regards,
> Werner
>
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>  Werner Bailer
>  Institute of Information Systems
>  JOANNEUM RESEARCH Forschungsgesellschaft mbH
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