Funny, you are all assuming the OP is using XSLT 2.0..
:-)
-----Oorspronkelijk bericht-----
Van: Wendell Piez [mailto:wapiez(_at_)mulberrytech(_dot_)com]
Verzonden: vrijdag 17 februari 2012 17:32
Aan: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Onderwerp: Re: [xsl] passing param using value-of
Hi again,
On 2/16/2012 6:03 PM, Andrew Welch wrote:
This works fine.
<xsl:call-template name="myTemplate">
<xsl:with-param name="arguments"
select="preceding-sibling::*">
</xsl:with-param>
</xsl:call-template>
But this doesn't:
<xsl:call-template name="myTemplate">
<xsl:with-param name="arguments">
<xsl:value-of select="preceding-sibling::*" />
</xsl:with-param>
</xsl:call-template>
Why ? How do I use value-of to set the value of a parameter ?
xsl:value-of generates a (single) text node. Depending on the
parameter,
that may be okay (or maybe not), even if the cases when a text node
is good
but a simple string is not even better are fairly rare.
Don't forget in the 2nd option that it's a text node child of a
document node, whereas in the first option (using select) it's
sequence type is element()* (i think)
Indeed. To spell this out:
<xsl:with-param name="arguments" select="preceding-sibling::*"/>
binds to $arguments a sequence of nodes, namely the preceding sibling
elements.
<xsl:with-param name="arguments">
<xsl:value-of select="preceding-sibling::*" />
</xsl:with-param>
binds to $arguments a temporary tree with a single text node, whose
value is determined by evaluating "preceding-sibling::*".
Probably you want the first of these, not the second. But even if you
wanted a string, not a sequence of nodes, you could specify that more
directly and more efficiently by operating directly on the preceding
siblings (with a function that returns a string) instead of by using
xsl:value-of.
Cheers,
Wendell
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