#[unsafe(no_mangle)]pub unsafe extern "C" fn polyxml_value_get_list_len(
val: *const PolyXmlValue,
out_len: *mut usize,
) -> PolyXmlErrorCode#[unsafe(no_mangle)]pub unsafe extern "C" fn polyxml_value_get_list_len(
val: *const PolyXmlValue,
out_len: *mut usize,
) -> PolyXmlErrorCode