[xsl] Reusing templates and params

Hi,
I'm having a problem trying to pass values between recursive templates.
Using XSLT 1.0 and tried to keep it a brief as possible.
I'm publishing "bits" of values then passing the remainder to another template 
to handle further, possibly passing back and forth a few times.

<!-- Start of fragment -->
<xsl:template name="A">
    <xsl:param name="valueA" />

    <!-- Do stuff ($anotherValue takes "bits" of $valueA) -->
    
    <xsl:if test="string-length($anotherValue) &gt; 0">
        <xsl:call-template name="B">
            <xsl:with-param name="valueB" select="substring($anotherValue,2)" />
        </xsl:call-template>
    </xsl:if>
</xsl:template>

<xsl:template name="B">
    <xsl:param name="valueB" />

    <!-- Do stuff ($anotherValue takes "bits" of $valueB) -->
    
    <xsl:if test="string-length($anotherValue) &gt; 0">

        <!-- Problem area - can test that $anotherValue has many characters in 
it but template "A" fails the xsl:if -->

        <xsl:call-template name="A">
            <xsl:with-param name="valueA" select="substring($anotherValue,2)" />
        </xsl:call-template>
    </xsl:if>
</xsl:template>
<!-- End of fragment -->

Thanks in advance,
Carl


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