Function xmlParseExternalEntity 

pub unsafe extern "C" fn xmlParseExternalEntity(
    doc: *mut xmlDoc,
    sax: *mut xmlSAXHandler,
    user_data: *mut c_void,
    depth: c_int,
    URL: *const xmlChar,
    ID: *const xmlChar,
    lst: *mut *mut xmlNode,
) -> c_int