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On Wed, 19 Jan 2005, Alan Gutierrez wrote: <excerpts>
> XPath notion is a path language. It expresses paths in a
> document. I'd like to have a stream langauge.
>
> Then you need something to indicate the order in the stream, I
> suggest using the comma.
> /a/b(foo, bar, baz)/c
> /a(b/foo, b)/c
>
> Then you can have proper pattern matching operators.
> /a(b/foo+, b*)/c
>
> Coming back to capturing.
> /a(<b>, c = $1)
The above examples with ordering and regular expression operators suggest
you could consider basing XPattern on patterns derived from RelaxNG-like
types rather than from XPath-like paths. If so, there is some prior work
that could be of use:
http://xduce.sourceforge.net/
XDuce didn't explicitly pursue support for streamed processing, but some
ideas might still be useful. The paper [2] (in ACM Transactions) on
http://xduce.sourceforge.net/papers.html contains the most readable
introduction.
Vladimir
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