- From: "Michael Kay" <mike@s...>
- To: "'David A. Lee'" <dlee@c...>
- Date: Tue, 29 Sep 2009 14:36:47 +0100
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The first question I have in mind is how do we parse
this. This one example of Michaels has me a little confused:
<xsl:sequence
select="xs:positiveInteger('5')"/>
This is the proposal
for how to represent a typed atomic value. This is pretty
obscure to my novice eyes. Reading this I wouldn't guess off hand that
this means "Atomic value, type xs:positiveInteger, text value '5'".
Well, I think it's merit is that it's familiar
syntax and semantics for anyone who knows XSLT 2.0 or wants to go and read the
spec. For many purposes, however, a more convenient syntax would be
<atomicValue value="5"
type="xs:positiveInteger"/>.
That then
leads me to the final question. Suppose we transform this serialized form
"almost an xslt" format, into "real xslt" format, then
run a real XSLT 2.0
parser on it. How to get the resulting values out ?
Please bear
with me as I'm very much a novice at XSLT ... maybe the answer is
"obvious".
XSLT 2.0 claims that the result of an XSLT transformation can be a
'set of result trees'.
Thats an XDM sequence . (???)
No: XQuery can produce any XDM sequence as output (well,
almost any - it can't for example generate unparsed entities); but XSLT can only
produce a set of document nodes. You can write an xsl:function to produce any
XDM sequence as its result, but you would need a processor-specific way of
invoking the function and capturing its result in the external
environment.
Incidentally, I was reminded of this project in some work with
a client yesterday. They are running MarkLogic queries and feeding the result
into Saxon, currently via lexical XML (it has to be serialized because it's on a
different machine). In this kind of scenario it would be nice to transfer a
typed document, but we really don't want a five-fold increase in document size
over the lexical XML. Size does matter.
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
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