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Re: Relationship between XSLT and ASP (was Re: asp problem)
- To: xsl-list at mulberrytech dot com
- Subject: Re: Relationship between XSLT and ASP (was Re: asp problem)
- From: Paul Tchistopolskii <paul at qub dot com>
- Date: Wed, 01 Mar 2000 18:26:22 -0800
- Organization: The Qub Group
- References: <Pine.LNX.4.10.10003011359210.21082-100000@loco.motives.com>
- Reply-To: xsl-list at mulberrytech dot com
Dan,
> > 4. It lacks streaming, that means every incoming stream of XML events
> > should get accumulated into DOM-alike structure before starting
> > processing, that also forces memory accolactions / deallocations again
> > and that means "you'l better to filter / sort / group on the level of
> > SQL server, but not on the level of XSLT"
>
> Maybe I'm entirely mistaken, but isn't the premise behind Cocoon 2 (for
> example) that you can use streaming-ish things like SAX and not have to
> build document trees for your source?
>
> I understand that you would have to build trees for your result output,
> due to aggregating functions such as <xsl:for-each> and so forth, but you
> should just be able to accumulate the output result as the input "stream"
> comes in.
Actualy, it is not xsl:for-each that kills streaming (or better to say
not every xsl:for-each kills streaming), because 'pull' xsl:for-each
could be transformed into appropriate 'push' apply-templates with
modes. Because 'push' with modes is OK for streaming that
means most of xsl:for-each could be also OK. 'Similiar' transformations
were done behind some implementations of efficient joins
( in SQL servers), I think.
The look-ahead pull transformation - that's what kills streaming
( ok - it could be masqueraded with blocking threads, but that's
another story ).
Briefly:
1. Either Cocoon 2 does not support look-ahead pull ( that means it is
not XSLT) or
2. Cocoon is cool and works around look-ahead pulls with threads
( and also transforms pull constructions into push invariants on the fly ).
Can't belive in (2) but if they realy did it - I apologize 10 times, will
download Cocoon immediately, will be happy to contribute to their
code e t.c.
> The only thing I might really be confused by is whether there is an
> intended meaning to the word "stream" which I'm missing.
I thing we both understand the word 'streaming' in the same way.
'being able to process the document without building the entire
document tree'.
Rgds.Paul.
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