Re: Cascading. ( Re: Recursive Template Application )

Subject: Re: Cascading. ( Re: Recursive Template Application )
From: Paul Tchistopolskii <paul@xxxxxxx>
Date: Tue, 20 Jun 2000 03:42:01 -0700
----- Original Message -----
From: Matt Sergeant

> > > > > Actually there is a standard way, but its outside the realm of XSLT and
> > > > > inside the realm of XML. Its called "cascading" and is detailed in the
> > > > > HTML 4.0 spec, and referenced explicitly in
> > > > >
> >
> > I'm sorry, I failed to find the word 'cascading' in the URL you are providing.
> > (funny that, eh?)
> Not very funny at all - you just didn't look hard enough ;-)
> The concept of cascading is detailed in _the_HTML_4.0_spec_. The HTML 4.0
> spec is "referenced explicitly in
>";. Does that make sense now?

Yes, it makes. 'Cascading'  is something that  was considered to be
good for HTML / CSS and now  there is some attempt to make this model
"... a standard way, but its outside the realm of XSLT and inside the
realm of XML. "

I still think it is funny.  The same pattern has been applied to XSL FOs.
I'm very happy that  XSLT and XPath have survived. No kidding.

> > It is good you have a standard technique to support some typical
> > usecases, like:
> >
> > "cat some.xml |  aggregate.xsl | expand_widgets.xsl |  render2pdf.xsl | render.class "
> >
> > and
> >
> > "cat some.xml |  aggregate.xsl | expand_widgets.xsl |  render2html.xsl "
> >
> > Mind to share how to do that with  AxKit powered by appropriate w3c
> > standard technique for cascading ?
> Sure:
> "cat some.xml"
> The "cat" here picks up the stylesheets that are to be used from the
> <?xml-stylesheet?> processing instructions, as per the w3c spec.

Hmm... In my example, 'cat'  is:


  <xsl:stylesheet version="1.0" xmlns:xsl="";>
  <xsl:param name="ux-argv1" />
  <xsl:template match="/">
  <xsl:copy-of select="document( $ux-argv1 )" />

'cat.xsl'  could be appied to any file and has no knowledge about the future
of the dataflow.

Do I understand right that in your universe 'cat' is transaction-specific thing?
In this case the semantics of your 'cat'  will be similiar to  semantics
of Ux pipe. ... but I think my guesses are wrong again. Could you pelase
explain *what*  is your  'cat'   which conforms to some w3c  standard (right?)

I wish you also have another 'standard'  answer regarding:

cat some.xml |  aggregate.xsl mode="terse" | expand_widgets.xsl  |  render2html.xsl

( I think that tuning transformations with some parameters is unavoidable
thing in the real life. Can you imagine scripts without parameters?  Scripts are
transformations ).

> > I'm sorry if it was  not appropriate to place this view on chaining
> > in reply to your letter ( because I now realize that your leter was
> > actualy talking about the standards which are good for us, right ? )
> Right. I'm not trying to flog AxKit to everyone here - most people will
> prefer a Java solution anyway (poor lost souls ;-)), just trying to point
> out that there is a standard for cascading that applies to XSLT.

I don't think it makes too much sense with XSLT.  BTW - I don't
see any problem if you explain to poor lost souls what variations
AxKit does ( or is planning to do ) around XSLT. I wish it is not the
off-topic here.

> >
> > Poor me, who is now using document( "!/ ls | sort | verbose") in almost
> > every XSLT stylesheet ....  It is not standard....
> Indeed - I'm amazed it even works ;-)

So was I,  when I realized that almost everything could be done with any
java component  if  the component  extends SAXparser. Ux embedds
XT,  because XT is  SAXParser.  Ux itself is a SAXParser so 'the entire thing '
could be easily embedded into other programm. I realy like this game and
hardly remember similiar things happening before XML.

BTW - is Salbotron SAXParser?  Is it providing parse() and
setDocumentHandler() to  the perl code? If yes - you can
have the same document( "/! perl-bean1 | perl-bean2" )
in perl. Ux pattern is universal and should be easy to
re-implement in any language, because it is plain SAX
and nothing more.


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