XSL processor stack has overflowed - can't understand why

Question

Hello guys,

I'm trying to conditionally display the content of HTML page depending if a document being generated for a recognised company or not.

However, the transformation doesn't work and I can't understand why :( I use MSXML3.0 as transformer and oXygen as IDE, which gives the errors I presented below.

What I do is to construct a long string of all recognised companies (default and extra if any). I then split them into <token> elements that are stored in the $companiesKnownList variable. To determine if a company is in that list I count how many times it occurs:

count($companiesKnownList/token[normalize-space(.) = $productName]) < 1

If it's less than 1, then the company doesn't appear in the $companiesKnownList variable and therefore is not recognized. Otherwise, if it appears in the $companiesKnownList variable once or more times it is a recognized company. Nevertheless, this is where it breaks and displays the following error:

Description: Code:   0x80004005
Description: The XSL processor stack has overflowed - probable cause is infinite template recursion.
Description: The transformer process ended with code: 1

I've noticed that if my XML has got a recognised company, ex @ProductName="ski" then transformation fails with stack overflow. If I have an unrecognized company, ex @ProductName="bla" the transformation works and text that it isn't a recognized company is displayed.

I don't understand what's going wrong with valid companies. I would be more than grateful if you could help me out. I have been staring at it for a day now...without any progress :S

Thanks!

Here is my stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
xmlns:str="http://exslt.org/strings"
extension-element-prefixes="msxsl str"
version="1.0">

<!-- Taken from http://www.exslt.org/str/functions/tokenize/index.html -->
<xsl:import href="str.tokenize.template.xsl"/>

<!-- normalize and lowcase product name -->
<xsl:variable name="productName"
    select="normalize-space(translate(/Doc/@ProductName, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'))"/>

<!-- default recognised companies for all docs -->
<xsl:variable name="defaultRecognisedCompanies" select="'ski, holiday, summer trips'"/>

<!-- Determine what companies to generate a doc for -->
<xsl:variable name="companiesKnownListRaw">
    <xsl:call-template name="recognisedCompanies"/>
</xsl:variable>

<xsl:variable name="companiesKnownList" select="msxsl:node-set($companiesKnownListRaw)"/>


<!-- Lists recognised companies for a document to be generated for -->
<xsl:template name="recognisedCompanies">
    <xsl:call-template name="recognisedCompaniesListForDocument"/>
</xsl:template>


<xsl:template name="recognisedCompaniesListForDocument">
    <xsl:param name="defaultCompanies" select="$defaultRecognisedCompanies"/>
    <xsl:param name="isUseDefaultsCompanies" select="true()"/>
    <xsl:param name="extraCompanies" select="''"/>


    <xsl:variable name="allCompaniesRaw">
        <xsl:call-template name="str:tokenize">
            <xsl:with-param name="string">
                <xsl:choose>
                    <!-- keep default companies -->
                    <xsl:when test="$isUseDefaultsCompanies = 'true'">
                        <xsl:value-of select="concat($defaultCompanies, ', ', $extraCompanies)"/>
                    </xsl:when>
                    <!-- discard default companies -->
                    <xsl:otherwise>
                        <xsl:value-of select="$extraCompanies"/>
                    </xsl:otherwise>
                </xsl:choose>
            </xsl:with-param>
            <xsl:with-param name="delimiters" select="','" />
        </xsl:call-template>
    </xsl:variable>

    <!-- Normalize token's value and discard empty values -->
    <xsl:for-each select="msxsl:node-set($allCompaniesRaw)/token">
        <xsl:if test="normalize-space(.) != ''">
            <token>
                <xsl:value-of select="normalize-space(.)"/>
            </token>
        </xsl:if>
    </xsl:for-each>
</xsl:template>


<!-- Construct HTML doc. Display appropriate message for a company if it's recognized or not -->
<xsl:output method="html" doctype-public="-//W3C//DTD HTML 4.01 Transitional//EN"
    doctype-system="http://www.w3.org/TR/html4/loose.dtd" encoding="UTF-8" indent="yes"/>

<xsl:template match="/Doc">
    <html>
        <xsl:choose>
            <!-- Not recognised company -->
            <!-- There is something wrong with the count conditions, and I don't understand what :( -->
            <xsl:when test="count($companiesKnownList/token[normalize-space(.) = $productName]) &lt; 1">
                <body>
                    <div align="center">
                        This type of company is NOT recognised for this document.
                    </div>
                </body>
            </xsl:when>
            <!-- Recognised company -->
            <xsl:otherwise>
                <body>
                    <div align="center">
                        This type of company is recognised for this document.
                    </div>
                </body>
            </xsl:otherwise>
        </xsl:choose>
    </html>
</xsl:template>
</xsl:stylesheet>

XML is something simple like:

In this example, ski is recognized company, but transformation fails. <?xml version="1.0" encoding="UTF-8"?> <Doc ProductName="ski" />

In this example, bla is not a recognized company and transformation succeeds with displaying text: "This type of company is NOT recognised for this document." <?xml version="1.0" encoding="UTF-8"?> <Doc ProductName="bla" />

Answer 1

MSXML (any version) does not support EXSLT -- and the XSLT processor produces an error message.

Could you, please, correct the question so that only true information is present?

Answer 2

You need to add the implementation of your named template str:tokenize. Check Jeni Tennison implementation at http://www.exslt.org/str/functions/tokenize/str.tokenize.template.xsl

Then, add this as stylesheet top element, with correct href:

<xsl:include href="str.tokenize.template.xsl"/>

With that changes (and closing your last template) with this input:

<Doc ProductName="ski" />

Ouput:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt;
<html>
    <body>
        <div align="center">
                        This type of company is recognised for this document.
        </div>
    </body>
</html>