Halliday & Matthiessen (1999: 478):
To the extent that intentionality enters into the semantic system of a language, it could in principle be construed ideationally as some aspect of the overall system of figures or be enacted interpersonally as a modality of inclination. If it is construed ideationally, it could in principle be a global property of a figure as a whole or a local property of the process or a participant.