[xsl] Concat function returning nodeset when param is part of arguments

Hi,

Running my code in version 11 of oxygen I'm getting the following
error on the matches function in the when test in the code below

Severity: error
Description: Attempting to access a sequence as a singleton item


<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:xs="http://www.w3.org/2001/XMLSchema"; version="2.0">
...
<xsl:param name="regex_string_tags" as="xs:string" select="'\[\[B\]\]'"/>
...
<xsl:variable name="matchingString" as="xs:string"
select="concat('^',$regex_string_tags,'(##[^#]+?##|\s)*?\[\[FONT')"/>
...
<xsl:when test="matches(.,$matchingString,$regex_flags)">


In the debugger it is stating that the variable matchingString is a
nodeset(5) rather than the string I would have expected.

I noticed that if I remove the parameter from the concat statement and
replace it with 'some string' it then returns a string as I expect
also if I change the param into a variable it returns a string.

<xsl:variable name="matchingString" as="xs:string"
select="concat('^','some string','(##[^#]+?##|\s)*?\[\[FONT')"/>

So why is the parameter having this effect?

I suppose I could have made a change I didn't notice however this was
working in version 10.3 of oxygen.

Thanks



--

Alex
https://sites.google.com/a/utg.edu.gm/alex

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