I have a xinclude with a fallback. The fallback contains a text node. When I evaluate the xpath string(/*[1]) on the result document to get the text content of the node, the result consists of the fallback-text two times, instead of once.

test.xml:
---
<root xmlns:xi="http://www.w3.org/2001/XInclude">
  <xi:include href="does_not_exist.xml">
    <xi:fallback>fallback-text</xi:fallback>
  </xi:include>
</root>
---

This is the bug:
---
# xmllint -xinclude -xpath 'string(/*[1])' test.xml 

  
    fallback-text
  fallback-text
---

This returns the expected result:
---
# xmllint -xinclude test.xml > resolved.xml 
# xmllint -xinclude -xpath 'string(/*[1])' resolved.xml 

  fallback-text
---

Reproducible with libxml 2.7.7 and the latest CVS head.