Re: Passing xs:string containing zero characters

Hi!

I'm new to XSLT 2.0 and using it with Saxon 9.1 in DITA-Open Toolkit.
I wrote following variable and pass it as a parameter as $prmLang to the
template.

<xsl:variable name="lang" as="xs:string" select="string(@xml:lang)"/>

<xsl:apply-templates select="child::*[contains(@class, '
topic/related-links ')]">
<xsl:with-param name="prmLang" as ="xs:string" select="$lang"/>
</xsl:aplly-templates>

<xsl:template match="*[contains(@class, ' topic/related-links ')]">
<xsl:param name="prmLang" as="xs:string" required="yes"/>
...
</xsl:template>

Then the following error is occured when $lang is empty string.

"[xslt] D:\DITA-OT1.5-FB\demo\xxx\xsl\xxx_dita2fo_relatedlinks.xsl:34:
Fatal Error! No value supplied for required parameter"

Is it a right behavior? I thought that xs:string can contain any
sequence of zero or more characters.

(If I rewrite the template code required="yes" to select="''", then it
works fine.)

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