[DDI-SRG] Two further URN/ID issues

[Wendy Thomas]

This was one of the delayed bugs...Arofan needed the specific regular 
expression to enter. We can fix this in the published version.

wendy

On Mon, 11 May 2009, Joachim Wackerow wrote:

> URNType in reusable should be formally described by a regular
> expression. This way basic syntax check for URN's is possible by
> validating against the XML Schemas. Currently URNType is just xs:anyURI,
> which seems to be very lax.
> Are there any reasons, why regular expression are not used already?
>
>
> BaseIDType is a xs:string restricted by the regular expression
> ([A-Z]|[a-z]|\*|@|[0-9]|_|$|\-)*
> The field documentation says: Valid characters include A-Z, a-z, @, 0-9,
> _, -, $
>
> There are two issues with this:
> - the dollar sign should be escaped in the regular expression
> - the asterisk - mentioned in the regexp is not described in the
> documentation
>
> Anyway, I'm wondering why are special signs ("*", "$", "@") necessary in
> an id. Are they really required?
>
> Especially the "@" can make problems in DDI URN resolution services.
> Some resolution service will use a REST-based approach for querying
> URN's like:
> http://xy.org/DDIURNResolutionService?URN
>
> URN is the query string of this URL. It stands for the complete DDI URN.
> A "@" is not allowed in a query string. It must be escaped according the
> rules for URL's. This is surely be possible, but makes things more
> complicated.
> Does "@" make really sense in an DDI ID?
>
> -- 
> GESIS - Leibniz Institute for the Social Sciences
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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 pop.umn.edu
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