On Jun 8, 2005, at 5:37 AM, Michael Kay wrote:
The only case where creating a temporary tree might be more efficient
is if
it's optimized for subsequent processing, e.g. if it contains derived
data,
sorted values, type annotations etc, that make subsequent computation
easier.
Right, which is the case in my stylesheets. Still, I get the feeling I
may rely too much on temporary trees in my current code.
For example, first I have this variable to suck in outside data:
<xsl:variable name="raw-biblist">
<modsCollection xmlns="http://www.loc.gov/mods/v3";
xmlns:bib="http://purl.org/NET/xbiblio/citeproc";>
<xsl:copy-of select="$bibrecord/*/mods:mods"/>
</modsCollection>
</xsl:variable>
Then I have this variable, which creates the enhanced data you mention
above:
<xsl:variable name="enhanced-biblist">
<mods:modsCollection
xmlns:bib="http://purl.org/NET/xbiblio/citeproc";>
<xsl:choose>
<xsl:when test="$sort_order-bib='citekey'">
<xsl:apply-templates
select="$raw-biblist/mods:modsCollection" mode="sort_citekey"/>
</xsl:when>
<xsl:when test="$sort_order-bib='cited'">
<xsl:apply-templates
select="$raw-biblist/mods:modsCollection" mode="sort_cited"/>
</xsl:when>
<xsl:when test="$sort_order-bib='author-year'">
<xsl:apply-templates
select="$raw-biblist/mods:modsCollection" mode="sort_author-year"/>
</xsl:when>
</xsl:choose>
</mods:modsCollection>
</xsl:variable>
... and then I do:
<xsl:variable name="bib:formatted-biblist">
<xsl:apply-templates
select="$enhanced-biblist/mods:modsCollection/mods:mods"
mode="temp-placeholder"/>
</xsl:variable>
The thinking that prompted my question is that maybe the enhanced data
gathered in the sort* modes in the second variable could be condensed
down to a few (tunnel) parameters, rather than the 8 or so nodes I
create in the temporary tree. If I understand right, that variable
could also use an "as" attribute of element()*, because in that case
I'd just be grouping and sorting, and applying templates with those
parameters.
Is it worth asking these sorts of questions, then, at least as I look
to optimize (e.g. after I get one or two more things working!)?
Bruce
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