Feature Suggestion - result subtrees as macro arguments (REVISED)

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

(After reviewing my post, I realize I screwed up and mixed two of my
(incompatible) thoughts into one ... this posting wholly replaces the
previous posting with the same title. Sorry for the confusion.
............. Ken)

Right now, macro arguments are attribute value templates:

<!ELEMENT xsl:arg EMPTY>
<!ATTLIST xsl:arg
  name NMTOKEN #REQUIRED
  value CDATA #REQUIRED
>

... and their default value can be specified:

<!ELEMENT xsl:macro-arg EMPTY>
<!ATTLIST xsl:macro-arg
  name NMTOKEN #REQUIRED
  default CDATA #IMPLIED
>

I've come across a situation where I'd like to supply to the macro a
fragment of the result tree as the value of an argument, as in the
following example:

<xsl:macro name="page-layout">
  <xsl:macro-arg name="title-block">
    <xsl:apply-templates match="title-prefix"/>
    <xsl:apply-templates match="title"/>
    <xsl:apply-templates match="title-suffix"/>
  </xsl:macro-arg>
  <xsl:apply-templates select="page-prefix"/>
  <xsl:arg name="title-block"/>
  <xsl:contents/>
</xsl:macro>
...
<xsl:template match="toc">
  <xsl:invoke macro="page-layout"> <!--supply custom title-->
    <xsl:use-arg name="title-block">
      <xsl:text>Table of Contents - </xsl:text>
      <xsl:apply-templates select="../prestitle"/>
    </xsl:use-arg>
    <xsl:apply-templates mode="toccreation" select="/">
  </xsl:invoke>
</xsl:template>
...
<xsl:template match="frame">
  <xsl:invoke macro="page-layout"> <!--using default title-->
    <xsl:apply-templates/>
  </xsl:invoke>
</xsl:template>

In the above, matching a normal frame adds the default "title-block"
subtree to the result tree, while matching the toc frame adds the supplied
"title-block" subtree to the result tree.

Can someone think of a better name than "xsl:use-arg" to identify the
subtree to be used as the macro argument in place of the default subtree to
use for the macro argument?

............ Ken 

--
G. Ken Holman         mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.  http://www.CraneSoftwrights.com/s/
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