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the value of 'sel' attribute selects a single unique element from the patched doc 'pos' attribute: “to” [default], “before”, “after” “before” = immediate preceding sibling node “after” = immediate following sibling node “to” = last child(ren) node or attribute/namespace 'type' attribute; values: node() [default], text(), @attr, namespace::prefix child element(s) or text content of |