Getting the parent node's position via xpath in xsl:for-each

Is there any way to access the parent node’s overall position from a for-each loup via xpath?


<book>     <part>         <chapter><author>Mary J.</author></chapter>         <chapter><author>John K.</author></chapter>         <chapter><author>Martin F.</author></chapter>     </part>     <part>         <chapter><author>Lisa G.</author></chapter>         <chapter><author>Harry T.</author></chapter>     </part> </book> 

Here’s the output I would like to have

Mary J. - 1   John K. - 2   Martin F. - 3   Lisa G. - 4   Harry T. - 5   

I do understand why the following does not work, in the given context, but is there any other way to have this done via xpath?

<xsl:template match="/">    <xsl:for-each select=".//author">       <xsl:value-of select="." />       <xsl:text> - </xsl:text>       <xsl:value-of select="ancestor::chapter/position()" />       <xsl:text>       </xsl:text>    </xsl:for-each> </xsl:template> 

or is the only solution via xsl:number, like this:

<xsl:template match="/">    <xsl:for-each select=".//author">       <xsl:value-of select="." />       <xsl:text> - </xsl:text>       <xsl:number from="book" level="any" select="parent::chapter" />       <xsl:text>       </xsl:text>    </xsl:for-each> </xsl:template> 
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If you want to use the chapter’s position, you could do:

<xsl:template match="/book">     <xsl:for-each select="part/chapter">         <xsl:variable name="chapter-number" select="position()" />         <xsl:for-each select="author">             <xsl:value-of select="."/>             <xsl:text> - </xsl:text>             <xsl:value-of select="$chapter-number"/>             <xsl:text>&#10;</xsl:text>         </xsl:for-each>     </xsl:for-each> </xsl:template> 
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