Type Alias xmlXPathVariableLookupFunc 

pub type xmlXPathVariableLookupFunc = unsafe extern "C" fn(ctxt: *mut c_void, name: *const xmlChar, ns_uri: *const xmlChar) -> *mut _xmlXPathObject;

Variable lookup function for XPath.

Returns an xmlXPathObjectPtr representing the variable’s value, or NULL.

UPSTREAM-PARITY

Ownership: The returned object is owned by the caller (must be freed).