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Re: XPattern Specification

Re:  XPattern Specification
* Petr Cimprich <petr@g...> [2005-01-17 10:33]:
> Alan Gutierrez wrote:
> >Thinking more in terms of pattern matching, less in terms of
> >   document traversal.
> > 
> >
> I have no problem with this kind of thinking (as far as I can see myself 
> :). Any streaming processing is more declarative and there is not much 
> space for a document traversal. But still, you have to maintain some 
> amount of information to be able to decide if a pattern matches or not.

> >       <xp:capture name="foo" select="/document/reverse"/>
> >       <xp:insert-after match="/document/reverse">
> >           <reversed><xp:value-of select="util::reverse($foo)"/></reversed>
> >       </xp:insert-after>

> When you process endElement for reverse, you need to know whether its 
> parent is document in order to decide if /document/reverse matches. This 
> information necessary for matching is what I call "the context".

> Then, you could navigate through the context data with a XPattern-like 
> language (with limited axis etc.), but this is another story. So, I'm 
> also talking about matching patterns against a stream of events; but I 
> just need to know what info is available to test the pattern.

    To match that partuclar end element, with that partucular
    pattern, you only need to update a state machine as the events
    stream by. There's no need to traverse at end element. The
    pattern matches and an event handler takes over the stream.


    /foo[baz/a/b/c = 'two']/bar[. = 'three']

    I can know that the above pattern matches at the end of the last
    bar, without keeping any nodes at all.

Alan Gutierrez - alan@e...


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