Subject: Re: [xsl] getting type information in xslt 2.0 From: "Dimitre Novatchev" <dnovatchev@xxxxxxxxx> Date: Wed, 25 Oct 2006 11:51:59 -0700 |
Anyhow, having to parse for nested sequences seems weird. Also, this approach sacrifices static type checking, as every function now has just one argument -- of type item*.
-- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play
> the examples you provided will not run in the case of a function that > has 2 or more arguments that must be sequences.
yes you need to be able to model sequences of sequences to do that. I started to do that (see: <xsl:variable name="q" as="element()"><f:q/></xsl:variable> which then isn't used, but I realised it was midnight and I ought to stop playing and go to bed so posted what I had:-) Note that that is a locally generated element (so with a distinct identity) rather than the global variable with empty elements used elsewhere.
If you model sequences of sequences by using XML element nesting then you lose type information, another way is to model [1,2,[3,4,5],[6,7,8]] as something like (<q'/>,1,2,<q''/>,3,4,5,<q''/>,<q'''/>,6,7,8,<q'''/>,<q'/>)
where q' q'' and q''' are three distinct element nodes with name q (each appearing twice in the sequence, denoting the start and end of a subsequence.
Given such a structure, with a bit of effort you can handle nested sequences, as you look at the next item, if it's not the special quote marker then you use the item, if it is a q then you grab the sequence up to the next (only) other item that is "is" equal to that item.
David
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