However, the pairing group does not currently implement such routines for encoding/decoding messages as group elements. This is on purpose given the difficulty and risks associated with implementing such encoding algorithms in pairing groups. Other techniques are used for pairings to provide the ability to convert from/to different message spaces.
It is not clear from the above what other techniques you have in mind. Could you expand a little?
The documentation states
It is not clear from the above what other techniques you have in mind. Could you expand a little?