Function xptr_eval 

pub unsafe fn xptr_eval(expr: &str, doc: *mut _xmlDoc) -> Option<*mut _xmlNode>

Evaluate an XPointer expression and return the pointed-to node.

Supports:

• Shorthand pointers — bare name treated as an element ID.
• element() scheme — element(id) selects the element with that ID; element(id/N) selects the N-th child (1-indexed) of that element, etc.

Returns None if the pointer does not resolve to a node.

Parameters

• expr — the XPointer expression (without the leading #).
• doc — pointer to the XML document to search in.

Safety

doc must be a valid, non-null pointer to a fully parsed _xmlDoc.