Can you please estimate the value reported in xsl:message in
a following stylesheet?
Saxon 9.1 reports value 2.
My expectation is 1.
If 2 is correct output then can you please justify it.
On the first call of p:test, neither parameter has a value. So $index
defaults to 1, and $value defaults to 1.
On the second call of p:test, $index has a value (2). No value has been
supplied for $value, so it defaults to $index, which is 2. This is the value
displayed.
Perhaps this is the relevant sentence in the spec (section 10.1.2):
<quote>
Equally, any default value is local to the template: specifying a default
value for a tunnel parameter does not change the set of tunnel parameters
that is passed on in further template calls.
</quote>
Thank you. That was very instructively.
I understand and accept this logic now, however
in my opinion this design is unnatural from the
perspective of genesis of tunnel parameters.
In xslt 1.0 one would write:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:p="http://www.nesterovsky-bros.com";>
<xsl:template match="/">
<xsl:call-template name="p:test"/>
</xsl:template>
<xsl:template name="p:test">
<xsl:param name="index" select="1"/>
<xsl:param name="value" select="$index"/>
<xsl:choose>
<xsl:when test="$index < 2">
<xsl:call-template name="p:test">
<xsl:with-param name="index" select="$index + 1"/>
<xsl:with-param name="value" select="$value"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:message select="$value"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
I thought the driving force for the introduction of tunnel
parameters was a desire to allow passing $value implicitly.
My simplified understanding of tunnel parameters was that
engine passes them behind the scene as if inserting
<xsl:with-param name="value" select="$value"/>
--
Vladimir Nesterovsky
http://www.nesterovsky-bros.com
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:p="http://www.nesterovsky-bros.com";>
<xsl:template match="/">
<xsl:call-template name="p:test"/>
</xsl:template>
<xsl:template name="p:test">
<xsl:param name="index" as="xs:integer" select="1"/>
<xsl:param name="value" tunnel="yes" as="xs:integer"
select="$index"/>
<xsl:choose>
<xsl:when test="$index lt 2">
<xsl:call-template name="p:test">
<xsl:with-param name="index" select="$index + 1"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:message select="$value"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
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