Query strings and namespaces
Matthew Graham
mjg at cacr.caltech.edu
Mon Jun 28 17:27:26 PDT 2004
Hi,
Further to my post about namespaces in queries from Friday (where and
when do we use them), here is an example:
- I want to find those services where the maximum number of records
returned is at least 100:
WHERE /resource/cs:capability/cs:maxRecords > 100 OR
/resource/sia:capability/sia:maxRecords > 100
Of course, a more succinct way of writing this might be:
WHERE /resource/capability/maxRecords > 100
But this is no use to me if I only want to find ConeSearch's whose maximum
return is at least 100. Do I then need:
WHERE /resource[@xsi:type = 'cs:ConeSearch']/capability/maxRecords > 100
or:
WHERE /resource[@xsi:type = 'cs:ConeSearch']/cs:capabilty/cs:maxRecords >
100
Quite a bit of this is dependent on how the resource is specified in the
first place: if there is full namespace qualification in the XML
(<resource>) then you will need to use namespaces in the XPath
constructions or mess around with local-name() functions a lot.
Cheers,
Matthew
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