[xsl] apply-templates xslt extension question

[ac <ac@xxxxxxxxxxxxx>]

Hi,

Couldn't apply-templates also accept node content, in addition to 
parameters and sorts, to provide better built-in streaming and 
parallelization support, as if one had:
<xsl:apply-templates mode="def">
<xsl:apply-templates mode="abc"/>
</xsl: apply-templates>
where, for example the inner invocation would apply-templates to the 
children of the context node as usual, and the result of that could be 
streamed directly to the outer invocation.  Of course, this could be 
nested to any required level (as well as to provide support for inner 
(e.g. local) node construction).  Instead of having to store the result 
of an invocation to a variable or parameter, before applying the second 
invocation, without need for, and in addition to, possible external 
pipelines, and with greater potential optimization, parallelization, and 
streaming?

I understand that many others must have proposed this before, but, at 
least, I would be happy to better understand the related rationale.

Thank you.

Regards,
ac