The reason it doesn't work in Xalan is that xsl:function is an XSLT 2.0
construct, and Xalan doesn't support XSLT 2.0.
It's probably marginally faster to use Saxon's native dateTime support, but
I doubt it makes a very big difference:
<xsl:function name="my:compDate" as="xs:boolean">
<xsl:param name="dt_a" as="xs:string" />
<xsl:param name="dt_b" as="xs:string" />
<xsl:sequence select="xs:dateTime(dt_a) gt xs:dateTime(dt_b)"/>
</xsl:function>
This isn't 100% identical, for example Saxon will throw a wobbly if the date
is 2005-02-29.
Note that you could use the <xsl:sequence select="(boolean expression)"/> in
your version as well.
Also, you could get rid of all three punctuation characters in a single call
on translate.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Jeffrey Schrab [mailto:jschrab(_at_)gsdesign(_dot_)com]
Sent: 21 September 2005 20:53
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] XSLT function optimization - datetime comparisons?
I don't profess to be well seasoned in XSLT. Simply put I
have a function that I call an awful lot in stylesheet. I'm
wondering if I'm being very inefficient about how it's coded.
Does anyone have any comments how best to do the comparison
that I'm doing below for datetimes of the form YYYY-MM-DDTHH:MM:SS ?
I'm using Saxon - I found that Xalan (2.7) just couldn't do
this sort of thing for reasons I don't understand to this day.
<xsl:function name="my:compDate" as="xs:boolean">
<xsl:param name="dt_a" as="xs:string" />
<xsl:param name="dt_b" as="xs:string" />
<xsl:choose>
<xsl:when test="
xs:integer(translate(translate(translate($dt_a,'-',''),'T','')
,':','')) gt
xs:integer(translate(translate(translate($dt_b,'-',''),'T','')
,':',''))">
<xsl:copy-of select="true()"/>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="false()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
--
Jeffrey Schrab
Internet Application Developer
GS Design
6665 N. Sidney Place
Milwaukee, WI 53209
P: 414.228.9666
F: 414.228.9652
E: jschrab(_at_)gsdesign(_dot_)com http://www.gsdesign.com
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