Re: suggestion: xsl:modified-copy

It's a bit late for 3.0, but perhaps for 3.1... sometimes it would be
useful to have the ability to copy and modify a section of the input
at the point its copied, rather than using an additional moded
identity template and no-op templates.

For example given something like:

<foo>
   <bar/>
   <baz/>
</foo>

and you want to copy the lot to the result except <baz/> you could do:

<xsl:modified-copy select="foo">
   <xsl:except select="baz"/>
</xsl:modified-copy>

<xsl:apply-templates select="foo" mode="m">
<xsl:mode name="m" on-no-match="shallow-copy"/>
<xsl:template mode="m" match="baz"/>

<xsl:apply-templates select="foo" on-no-match="shallow-copy">
  <xsl:template match="baz"/>
</xsl:apply-templates>

if you wanted to add another <baz/> you could do:

<xsl:modified-copy select="foo">
   <xsl:insert-after select="baz">
     <baz/>
   </xsl:insert-after>
</xsl:modified-copy>

Again, that's

<xsl:apply-templates select="foo" mode="m">
<xsl:mode name="m" on-no-match="shallow-copy"/>
<xsl:template mode="m" match="baz">
  <xsl:next-match/>
  <baz/>
</xsl:template>

Michael Kay
Saxonica