XSLT: Test Parameter to know if it has been set
xslt
Solution
Of the suggestions made to date, the only solution that worked was to always set the parameter value when a call to the template is made. For example, previously I had:
<xsl:apply-templates select="//xs:complexType[@name='AddressType']" />
This had to be changed to:
<xsl:apply-templates select="//xs:complexType[@name='AddressType']">
<xsl:with-param name="prefix" select="'AcRec'" />
</xsl:apply-templates>
I'd really like to know why not($param) and $param='' don't work in a WHEN test, yet I can get the value of not($param) in a xsl:value-of statement.
Problem
I have a situation where the param won't be set, but my attempts to capture & handle the sitation aren't working. I'm using the following: ``` <xsl:template match="xs:complexType"> <xsl:param name="prefix" /> <xsl:variable name="prefix-no-core"> <xsl:choose> <!-- if no value, default to 'AcRec' --> <xsl:when test="not($prefix)"> <xsl:value-of select="'AcRec'" /> </xsl:when> <!-- if 'core', leave as empty string --> <xsl:when test="$prefix = 'core'"> </xsl:when> <!-- if 'AcRec', set the value --> <xsl:when test="$prefix = 'AcRec'"> <xsl:value-of select="$prefix" /> </xsl:when> </xsl:choose> </xsl:variable> <xs:complexType name="{concat($prefix-no-core, @name)}"> ... </xsl:template> ``` I've also tried $prefix='' in the first test - neither work. but if I use: ``` <xsl:value-of select="not($prefix)" /> ``` ... the value prints out as true. But using that in my xsl:choose doesn't produce any output.