> In trying to work out if it should be >[prefix=]uri or >prefix[=uri]

The first.


> I had a look at the XCQL XML Schema on the CQL web site.
> I could not find support for the default value - I assume its been
> proposed after the XML Schema for XCQL was written.

You just give <prefix><identifier>uri</identifier></prefix>

> How would it be done? Just make that sub-element of the <prefix> element
> optional?

<name> should be optional in XCQL. (If it's not, then it should be)


> ps: I noticed there was a <prefixes> element allowed inside each
> search clause and boolean operator node. An alternative would have

This was because originally prefixes could only occur at the beginning of
a query, rather than anywhere. So it was easiest to add an optional
prefixes element rather than the nested form which is closer to the CQL.

> (For >a((((b=c)))) you have to push down the prefixes wrapped node.
> Wrapping with a prefix element is easier. Not a big deal though.)

Yep.  Pull out the prefixes into a temporary area until you find a
clause or triple, then assign them to it.  (with an XCQL like
internal structure at least)

Rob


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