[DDI-users] Question about Dublin Core elements

[Wendy Thomas]

search Ski-U-Mah

On Tue, Jan 13, 2015 at 5:44 PM, Samuel Spencer <theodore.therone at gmail.com>
wrote:

> Wendy,
>
> The prefix is relatively unimportant when serialising XML. Technically the
> namespace for the Dublin Core elements is "
> http://purl.org/dc/elements/1.1/", while the namespace for Dublin Core
> Terms is "http://purl.org/dc/terms/".When declaring their use in an XML
> document, you give a local prefix, like: xmlns:dc="
> http://purl.org/dc/elements/1.1/", but this only has scope to that
> document.
>
> When handling XML, systems are free to convert a prefix to the full
> namespace or replace them, or merge them, hence the occasional appearance
> of ns1, ns2, ns3, etc..., once a document has been processed.
>
> Of note, (I believe) it is impossible to set two namespaces to have the
> same prefix, but the same namespace can have multiple prefixes, so this is
> impossible:
>
> <xml xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dc="
> http://purl.org/dc/terms/" />
>
> But this is is legal (albeit confusing):
>
> <xml xmlns:dcterms="http://purl.org/dc/elements/1.1/" xmlns:dc="
> http://purl.org/dc/elements/1.1/" />
>
> Also note, in the above example after processing an XML processor may
> decide to replace/harmonise the prefixes so they have the same prefix,
> given that they both belong to the same namespace.
>
> Ultimately, prefixes should be human readable, so I'd recommend dc/dcterms
> to differentiate. But there is no requirement for this, so you can use
> dc/dcterms, or stick with defaults like ns1/ns2, or get wild:
>
> <michiganRocks:Fragment
>    xsi:schemaLocation="ddi:instance:3_2
> http://www.ddialliance.org/Specification/DDI-Lifecycle/3.2/XMLSchema/instance.xsd
> "
>    xmlns:michiganRocks="ddi:instance:3_2"
>    xmlns:goBlue="ddi:reusable:3_2"
>    >
> <goBlue:Note>Please don't do this in practice!</goBlue:Note>
> </michiganRocks:Fragment>
>
> Cheers,
> Sam.
>
> PS. I realised far too late the MN is Minnesota, not Michigan, but I don't
> know any UMN chants. Plus the list is hosted by UMich. So Go Blue I guess.
>
> On Wed Jan 14 2015 at 10:19:21 Wendy Thomas <wlt at umn.edu> wrote:
>
>> Hi everyone!
>> Trying to get some user feedback. When we expanded the use of native
>> Dublin Core from the base set to qualified Dublin Core (DDI-C 2.5 and DDI-L
>> 3.2) we did it in a way that used the namespace dc: for all elements
>> regardless of whether they were dc or dcterms. I use both in some
>> bibliographic management at the MPC and was wondering if the consistent use
>> of the single namespace dc: caused problems for people.
>>
>> I ask because we want to update the dcterms.xsd distributed in the DDI
>> package to the 2008 version (which adds a number of elements). My gut
>> response was to do so in a way that supported the use of both dc and
>> dcterms but wanted to check with those of you who currently use it,
>> especially if you use objects from the dcterms.xsd.
>>
>> Thanks for your input!
>> Wendy
>>
>> --
>> Wendy L. Thomas                              Phone: +1 612.624.4389
>> Data Access Core Director                 Fax:   +1 612.626.8375
>> Minnesota Population Center             Email: wlt at umn.edu
>> University of Minnesota
>> 50 Willey Hall
>> 225 19th Avenue South
>> Minneapolis, MN 55455
>>  _______________________________________________
>> DDI-users mailing list
>> DDI-users at icpsr.umich.edu
>> http://lists.icpsr.umich.edu/mailman/listinfo/ddi-users
>>
>
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>


-- 
Wendy L. Thomas                              Phone: +1 612.624.4389
Data Access Core Director                 Fax:   +1 612.626.8375
Minnesota Population Center             Email: wlt at umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455
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