This is a very rare 'Hui' (Muslim) martial art - developed and practiced within China by descendants of Arab merchants (and travellers) who settled in China around a thousand years ago (and at other times after this date). These men were generally highly respected by the Chinese Authorities and often married Chinese women - altered or changed their surnames to fit-in - and sired 'Chinese' children often brought-up within the Islamic faith. This martial art was developed by three respected Imans serving in the Bozhou (亳州) Mosque of Beijing during the reign of Qing Dynasty Emperor Daoguang (r. 1813-1820) and is comprised of various Chinese martial arts techniques as gathered by Hui people living primarily in the Henan, Anhui, Shandong areas - as well other places:
If I am reading this name correctly (see HERE for more information), this art is emphasising intellectual and physical study (晰 - Xi), a process which builds 'Yang' (阳) energy which represents the 'sun' or 'brightness' (the literal meaning of 'Yang') represented by Allah! As Muslims only practice for self-defence the 'open-hand' or 'palm' (掌 - Zhang) is emphasised over the closed fist. Yin and Yang are developed equally with the inner and outer body being made strong and healthy so that the practitioners can a) pray properly and recite the Holy Qur'an in the Mosques, b) perform wholesome labour properly within society and c) maintain the strength to carry-out charitable work and help others free of charge. As this art builds outer strength for praying and inner strength for recitation - by cultivsting Yin and Yang (using martial techniques derived from at least three other provinces) - it is also known by the name of 'Three Considered Profundities' (三议妙 - San Yi Miao). The art itself must only be used to protect vulnerable individuals (including the practittioner) from attack (or 'insult') within society - but the rules for this are very strict (Halal).
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.