<select-elements from="children">
<element type="article">
<element type="artheader">
<target-element type="title"/>
</element>
</element>
</select-elements>
A.
childNumber(this).
childNumber(ancestor("sect1", this)).childNumber(this).
childNumber(ancestor("sect1", this)).childNumber(ancestor("sect2", this)).childNumber(this).
""
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*