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RE: [xsl] Variables and HTML

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OK, thanx Michael and David - you both are a complementing answering machine
:-)

That leaves me with the question why it is not encouragable to couple
transformers and serializers... may we assume that serializers are kept out
of the spec's domain is because serializers are too system specific?

Cheers,
<prs/>

-----Original Message-----
From: David Carlisle [mailto:davidc@xxxxxxxxx] 
Sent: Viernes, 11 de Marzo de 2005 04:19 a.m.
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] Variables and HTML

 

I wrote

   In addition to Michael's reasons, there is also the fact that 2.0 has
   character maps that can be used for many of the things that d-o-e is
   used for in a slightly less disruptive way architecturally.

   David

To expand on that, one of the problems with d-o-e is that you can go
<xsl:value-of select="'&lt;br&gt;'"/> <xsl:value-of
disable-output-escaping="yes" select="'&lt;br&gt;'"/>

and the model is that that puts something  into the result tree which when
linearised at the end of the process produces

&lt;br&gt;<br>

The trouble is that, as specified, there isn't really anything that can go
into result tree text nodes that can have that effect, so systems that
support d-o-e have to have some private internal annotations to record those
bits of the tree where d-o-e is in effect.

In 2.0 you can always replace this by

<xsl:value-of select="'&lt;br&gt;'"/>
<xsl:value-of
select="translate('&lt;br&gt;','&lt;&gt;&amp;','&#xE001;&#xE002;&#xE003;'"/>

Together with a character mao that maps back:

<xsl:output-character character="&#xE001; string="&lt;"/>
<xsl:output-character character="&#xE002; string="&gt;"/>
<xsl:output-character character="&#xE003; string="&amp;"/>

This works the same way except that now the information is stored in the
result tree using a mechanism that is actually allowed by the specification
of the datamodel (just three otherwise unused characters).


Of course the other problems with d-o-e remain, that this still only works
if serialisation is tightly controlled by the XSLT engine and that in nine
times out of ten it is only being used by mistake, when the stylesheet could
have gone

<br/>

and used an element node directly.

David

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