Function xmlXPathNodeSetAddNs 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlXPathNodeSetAddNs(
    cur: *mut _xmlNodeSet,
    _node: *mut _xmlNode,
    ns: *mut _xmlNs,
) -> c_int

int xmlXPathNodeSetAddNs(xmlNodeSetPtr cur, xmlNodePtr node, xmlNsPtr ns) — adds the namespace declaration as a namespace node.

SAFETY

• cur must be a valid node set or NULL.