chickadee » sxpath » sxml:xpointer

Returns a procedure that accepts an SXML document tree and returns a nodeset (list of nodes) that match the XPointer expression string.

The optional ns-binding argument is an alist of namespace bindings. It is used to map abbreviated namespace prefixes to full URI strings.

Currently, only the XPointer xmlns() and xpointer() schemes are implemented, the element() scheme is not.

;; selects all the 'item' elements that have an 'olist' parent
;; (which is not root) and that are in the same document as the context node.
;; Equivalent to (txpath "//olist/item").
((sxml:xpointer "xpointer(//olist/item)")
 '(doc (olist (item "1")) (item "2") (nested (olist (item "3")))))
 => ((item "1") (item "3"))

;; An example with a namespace prefix, now using the XPointer xmlns()
;; function instead of the ns-binding parameter. xmlns always have full
;; namespace names on their right-hand side, never bound shortcuts.
((sxml:xpointer "xmlns(x=bar)xpointer(//x:olist/item)")
 '(doc (bar:olist (item "1")) (item "2") (nested (olist (item "3")))))
 => ((item "1"))