[www-xpath-comments] <none>

In the xpath document one example is the path expression:
   /descendant::olist/child::item 

The document says that this:
   selects all the item elements in the same document as the context node that have an olist parent

I find this explanation difficult to parse and am wondering
whether what you mean is:

   selects all item elements with an olist parent which are in the
same document as the context node.

--Len