_XA_ATOM_PAIR
_XA_CHARACTER_POSITION
_XA_CLASS
_XA_CLIENT_WINDOW
_XA_CLIPBOARD
_XA_COMPOUND_TEXT
_XA_DECNET_ADDRESS
_XA_DELETE
_XA_FILENAME
_XA_HOSTNAME
_XA_IP_ADDRESS
_XA_LENGTH
_XA_LIST_LENGTH
_XA_NAME
_XA_NET_ADDRESS
_XA_NULL
_XA_OWNER_OS
_XA_SPAN
_XA_TARGETS
_XA_TEXT
_XA_TIMESTAMP
_XA_USER
_XA_UTF8_STRING