I am trying to use to sort nodes based on a particular element that can be at any lower level within the XML tree.

Say I have the following XML structure:

<Concepts>
<Concept>
    <Type>C</Type>
</Concept>

<Concept>
    <Type>A</Type>
</Concept>

<Concept>
    <OR>
        <Type>B</Type>
    </OR>
    <OR>
        <Type>B</Type>
    </OR>
</Concept>
</Concepts>

Note that any <Type> within a <Concept> will be of the same value, as in the case of <Type>B</Type>.

I tried to use the following XSLT1.0 code, but to no avail:

<xsl:template match="/">
    <ul>
        <xsl:for-each select="Concepts/Concept">
            <xsl:sort select="//Type"/>
            <li><xsl:value-of select="."/></li>
        </xsl:for-each>
    </ul>
</xsl:template>

The resulting output is:

• C


• A


• B B

and I was hoping for:

• A


• B B


• C