I have some source XML that contains cross-references to multiple values within one attribute. I need to separate these into their own distinct elements with attribute values.

Input XML:

<p>Blah blah blah <xref ref-type="bibr" rid="ref004 ref005 ref006 ref007">4–7</xref>.</p>

Desired Output XML:

<p>Blah blah blah <xref ref-type="bibr" rid="ref004 ref005 ref006 ref007">4</xref><xref
        ref-type="bibr" rid="ref005"/><xref ref-type="bibr" rid="ref006"/>–<xref
        ref-type="bibr" rid="ref007">7</xref>.</p>

Notice the 2 cross-references in the middle become empty elements.

I have the following XSLT but it’s not getting me the correct output – it’s inserting the attribute values as element content.

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

<xsl:template match="xref">
    <xsl:variable name="rid" select="@rid"/>
    <xsl:choose>
        <xsl:when test="contains($rid, ' ')">
            <!-- Multiple references -->
            <xsl:variable name="refs" select="tokenize($rid, ' ')"/>
            <xsl:for-each select="$refs">
                <xsl:if test="position() > 1">
                    <xsl:text> </xsl:text>
                </xsl:if>
                <xsl:variable name="refNum" select="substring-after(., 'ref')"/>
                <xsl:element name="xref">
                    <xsl:attribute name="ref-type">bibr</xsl:attribute>
                    <xsl:attribute name="rid">
                        <xsl:value-of select="concat('ref', $refNum)"/>
                    </xsl:attribute>
                    <xsl:value-of select="."/>
                </xsl:element>
            </xsl:for-each>
        </xsl:when>
        <xsl:otherwise>
            <!-- Single reference -->
            <xsl:element name="xref">
                <xsl:attribute name="ref-type">bibr</xsl:attribute>
                <xsl:attribute name="rid">
                    <xsl:value-of select="$rid"/>
                </xsl:attribute>
                <xsl:value-of select="."/>
            </xsl:element>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>