DO NOT REPLY [Bug 29131] New: - "Unknown error in XPath" occurs on fairly complex XPath expression

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http://issues.apache.org/bugzilla/show_bug.cgi?id=29131

"Unknown error in XPath" occurs on fairly complex XPath expression

           Summary: "Unknown error in XPath" occurs on fairly complex XPath
                    expression
           Product: XalanJ2
           Version: 2.6
          Platform: PC
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Xalan
        AssignedTo: xalan-dev@xml.apache.org
        ReportedBy: lars@huttar.net


This happens with Xalan 2.6.0, as it also did with Xalan 2.5.1.
I'm not using xsltc.
I will attach the stylesheet which gives this error, and the input XML, if possible.
The error is occurring within Cocoon.
Here's the line that causes the error (or at least, the error occurs iff this
line is not commented out:)
<xsl:variable name="role"
select="(ancestor::view/@role)|(ancestor::view/@type[not(current()/ancestor::view/@role)])"
/>

On the other hand, when the following line is substituted for the above, the
stylesheet works fine, with no errors:
	  <xsl:variable name="role"
select="(ancestor::view/@role)|$base[not(current()/ancestor::view/@role)]" />		

The variable 'base' is defined as follows (at top level of stylesheet):

   <!-- create a variable whose value is a nodeset whose string value is 'base' -->
   <xsl:variable name="base-aux" select="base" />
   <xsl:variable name="base"
select="document('')/*/xsl:variable[@name='base-aux']/@select" />

The above is somewhat of a kludge, and I'd prefer to get rid of the 'base'
variable, but can't because of the error. (Incidentally, where I'm using @type
above, in the line that causes the error, its value is 'base'.)

I tried the same stylesheet on the same input with Saxon and with XMLSpy's XSLT
engine (outside Cocoon), and both gave the expected output without errors.

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