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xmllint.exe --xpath " //header[ contains(.,'rationale') ]/l /preceding
+-sibling::* " fudge
xmllint.exe --xpath " //header[ contains(.,'rationale') ]/child::text(
+) " fudge

<fudge> 
    <root>
        <part>
...
        </part>
    </root>
</fudge>

xmllint.exe --xpath " //header[ contains(.,'rationale') ]/child::text(
+) | //header[ contains(.,'rationale') ] /l/preceding-sibling::*   " f
+udge

...