Function xmlReaderNewDoc 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlReaderNewDoc(
    reader: *mut XmlTextReader,
    cur: *const xmlChar,
    URL: *const c_char,
    encoding: *const c_char,
    options: c_int,
) -> c_int

int xmlReaderNewDoc(xmlTextReaderPtr reader, const xmlChar *cur, const char *URL, const char *encoding, int options).