Dear fellow saxon enthusiasts,

I'm running into a silly error and I'm wondering if this isn't a saxon-specific problem.

Trying to convert some specific XMLSS content into other XML content and I'm getting an error message from within a function:

Under saxonb9-0-0-4j

Error on line 23 of file:/w:/DSI/Developpement/HorizonPhase1/Saxonica/HorizonConfig/GenerateHorizonConfig-SAVE.xsl:
  XPDY0002: Axis step child::element(false, xs:anyType) cannot be used here: the context item is undefined
Failed to compile stylesheet. 1 error detected.

Yet line 23 is simply:

                <xsl:sequence select="xs:boolean(false)" />

The whole stylesheet is:

  version="2.0" exclude-result-prefixes="xs f xsl ss">

<xsl:output indent="yes" encoding="UTF-8" />  

<xsl:variable name="f:IMS_START" as="xs:string" select="'IMS-'" />

<!-- Check that we have the right number of Worksheets that start with a given Prefix -->
<xsl:function name="f:checkForWorksheet" as="xs:boolean">
    <xsl:param name="f:workbook" as="element(ss:Workbook)" />
    <xsl:param name="f:sheetStartsWith" as="xs:string" />
        <xsl:variable name="f:sheets"     as="element()"  select="$f:workbook[starts-with(@ss:Name, $f:sheetStartsWith)]" />
        <xsl:variable name="f:sheetCount" as="xs:integer" select="count($f:sheets)" />
        <xsl:when test="$f:sheetCount lt 1" >
                <xsl:sequence select="xs:boolean(false)" />
        <xsl:otherwise >
                <xsl:sequence select="xs:boolean(true)" />


<xsl:template match="/" >
        <xs:variable name="f:testme" select="$f:checkForWorksheet(ss:Workbook, $f:IMS_START)" />


Thanks for any pointers on this.



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