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entity-resolution message

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Subject: Entity resolution & Web services

Hi.  At the recent CSW XML Summer School, Lauren posed the question of  
whether there was an entity resolution angle for Web services, one that  
would make a stronger business case for companies to use XML catalogues.

I wasn't able to think of such an angle per se, but it did occur to me  
that there is an interesting security angle we may have missed.  Some  
people, for better or for worse, would like to be able to follow the W3C  
guideline that you should version Schemas in preference to namespaces.   
The problem is that there is no real way to identify a Schema version in  
an instance document.  The best you can do is to use a 'schemaLocation'  
hint, but that is a security issue, because someone could send you an XML  
instance with a Schema location pointing to a wrong Schema, or even a  
Schema 'bomb'.  On the other hand, if they sent you an instance whose  
Schema location is a well known URL that you trust, that would be OK.  So  
for this use case, you would want to be able to have a default rule along  
the lines of "if none of my specific rules matched the schema location,  
then set it to empty/null or throw an exception or something like that".   
I can't think of a way to do that now, but does anyone else think it might  
be a useful enhancement to have?  Just a thought.

Cheers, Tony.
Anthony B. Coates
London Market Systems Limited
33 Throgmorton Street, London, EC2N 2BR, UK
Mobile/Cell: +44 (79) 0543 9026
[MDDL Editor (Market Data Definition Language), http://www.mddl.org/]
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