Thank you for your didactic explanations, Ken. It will help me next time I am
trying to complicate things :)
Regards,
Fabien
-----Message d'origine-----
De : G. Ken Holman [mailto:gkholman(_at_)CraneSoftwrights(_dot_)com]
Envoyé : lundi 4 juillet 2011 17:06
À : xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Objet : Re: [xsl] sequence as function parameter
At 2011-07-04 16:46 +0200, Fabien Tillier wrote:
I am trying to create a simple function to multiply each item in a
sequence by each other (like a sum()).
My problem is that I am unable to have the parameter treated as a node
sequence (using saxon, so XSL2.0)
I have
<xsl:template name=" multiplie">
That is a template, not a function, so I'm guessing we aren't looking
at the code that produced your result. Perhaps you are simply
calling the template from the function?
<xsl:param name="serie"/>
<xsl:param name="result" as="xs:double"/>
Doesn't this have an initial value of 1? Your template won't work if
you pass an initial sequence of only a single value because you are
multiplying that by the result and the result has no value.
<!--some test output -->
<xsl:value-of select="$serie"/>-<xsl:value-of
select="$result"/>--
###<xsl:value-of select="count($serie)"/>###
<!-- -->
<xsl:choose>
<xsl:when test="count($serie) gt 1">
<!-- make the multiplication between result and
the first item in the serie, then remove it and call again -->
<xsl:variable name="comp">
<xsl:value-of select="number($serie[1])
* $result"/>
</xsl:variable>
This is wastefully creating a node tree...
<xsl:call-template name=" multiplie">
<xsl:with-param name="serie"><xsl:copy-of
select="subsequence($serie,2)"/></xsl:with-param>
... as is this ...
<xsl:with-param name="result"><xsl:value-of
select="$comp"/></xsl:with-param>
... and that.
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="number($serie[1]) *
$result"/>
Here is where your template won't work if you pass it an initial
sequence of a single value.
...
So, the part where I do a count gets me 1, when I should have 4...
I have tried with
<xsl:param name="serie" as="node()*"/> but I have an error message
XTTE0790: Required item type of first argument of multiplie() is node();
supplied
value has item type xs:double
If you want to pass either nodes or atomic values then use:
as="item()*"
I am a bit out of ideas....
I think you are looking too deep. And certainly your use of XSLT
constructs could be more streamlined. I believe you can implement
your requirement completely in a one-line template with one parameter.
Does the example below help?
. . . . . . . . Ken
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:f="urn:X-Fabien"
version="2.0">
<xsl:template match="/">
?<xsl:variable name="seq" select="(6.8E-06,5.5E-06,7.1E-06,7.3E-06)"/>
Fabien's test: <xsl:value-of select="f:multiplie($seq)"/>
Ken's tests: <xsl:value-of select="f:multiplie((7))"/>
and: <xsl:value-of select="f:multiplie((1,2,3,4,5))"/>
</xsl:template>
<xsl:function name="f:multiplie">
<xsl:param name="seq" as="item()+"/><!--at least one item in sequence-->
<xsl:sequence select="if( count($seq)=1 ) then $seq
else $seq[1] * f:multiplie($seq[position()>1])"/>
</xsl:function>
</xsl:stylesheet>
--
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