Namespace Stopping XSLT Working

Question

I have got an XSLT that looks like this:

Answer 1

Define namesapce in XSLT, i.e.:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:r="http://www.castiron.com/response" exclude-result-prefixes="r">

    <xsl:output method="xml" indent="yes"/>
    <xsl:strip-space elements="*"/>

    <xsl:template match="@* | node()">
        <xsl:param name="month"/>
        <xsl:copy>
            <xsl:apply-templates select="@* | node()">
                <xsl:with-param name="month" select="$month"/>
            </xsl:apply-templates>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="r:month">
        <xsl:param name="month"/>
        <month xmlns="http://www.castiron.com/response">
            <xsl:choose>
                <xsl:when test="$month">
                    <xsl:value-of select="$month"/>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:apply-templates/>
                </xsl:otherwise>
            </xsl:choose>
        </month>
    </xsl:template>

    <xsl:template name="splitMonths">
        <xsl:param name="months"/>
        <xsl:variable name="firstMonth" select="substring-before($months,',')"/>
        <xsl:variable name="month">
            <xsl:choose>
                <xsl:when test="$firstMonth">
                    <xsl:value-of select="$firstMonth"/>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:value-of select="$months"/>
                </xsl:otherwise>
            </xsl:choose>
        </xsl:variable>
        <xsl:variable name="otherMonths" select="substring-after($months,',')"/>
        <xsl:if test="$month">
            <xsl:apply-templates>
                <xsl:with-param name="month" select="$month"/>
            </xsl:apply-templates>
        </xsl:if>
        <xsl:if test="$otherMonths">
            <xsl:call-template name="splitMonths">
                <xsl:with-param name="months" select="$otherMonths"/>
            </xsl:call-template>
        </xsl:if>
    </xsl:template>

    <xsl:template match="r:payload">
        <payload xmlns="http://www.castiron.com/response">
            <xsl:call-template name="splitMonths">
                <xsl:with-param name="months" select="r:sets/r:month"/>
            </xsl:call-template>
        </payload>
    </xsl:template>

</xsl:stylesheet>

Answer 2

That's because the rule match="month" is a different to match="{http://www.castiron.com/response}month". They have the same node name but since they're in different namespaces they're considered different nodes.