Matthias Brantner wrote:
I know this has been discussed several times and it seems the
conclusin was it's impossible if we would like to use existing XQuery
external modules (some are by license reasons and some are by
techinical reasons).
So it seems the only way to support XQuery is, developing our own
XQuery functionality from scratch. I'm wondering if other people reach
the same conclusion as me, or is it a totaly impossible project?
Well xquilla on top of xerces should get us pretty much were we need to go.
They are both under the Apache 2 license, which I believe would be ok. But they
are C++ so I don't know if we could use them.
I found Zorba, its C++ and Apache 2. But I don't know much about it. But it
looks promising.
http://www.zorba-xquery.com/
Sounds like a great project. Please, let us know
(zorba-us...@lists.sourceforge.net) if you need any help or have questions with
regard to plugging Zorba to PostGreSQL. We would love to see this happen and
help.
Well, maybe you can answer the questions I had last time I looked at it,
namely:
XQuery is a whole other question. Adding another library dependency is
something we try to avoid. Zorba <http://www.zorba-xquery.com/> might
work, but it appears to have its own impressive list of dependencies
(why does it require both libxml2 and xerces-c? That looks a bit
redundant.)
Even if we did implement XMLTABLE, I think I'd probably be inclined to
start by limiting it to plain XPath, without the FLWOR stuff. I think
that would satisfy the vast majority of needs, although you might feel
differently. (Do a Google for XMLTABLE - every example I found uses
plain XPath expressions.)
A much more urgent need we have, IMNSHO, than for XQuery, is for XSLT
support that actually works. But maybe that's just me.
cheers
andrew
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