Cannot write xml:lang to content.opf

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I have specified an xml:lang value in a book
      element (i.e.
      not within an info tag) and need to write that value to the
      content.opf
      metadata element. 

    
Here is my customisation:

    
<xsl:element namespace="http://purl.org/dc/elements/1.1/" name="dcterms:language">

                        <xsl:apply-templates

                       
        select="d:book[@xml:lang]|d:article[@xml:lang]|d:part[@xml:lang]" />

                      </xsl:element>

    
And all I get in content.opf is an empty
      element:

    
<dcterms:language xmlns:dcterms="http://purl.org/dc/elements/1.1/" />

    
What am I missing from the element selection
      syntax? I'm using 1.76.1, epub2. Thanks

    
    
    
    
    
    
    
    
-- 

      Dave Gardiner