I offer several concrete examples: The first issue the new government of the Hong Kong Special Administrative Region (HKSAR) had to resolve involved cases of permanent Chinese residents of Hong Kong with children living in mainland China. Should the children have the right to reside in Hong Kong? The Sino-British Joint Declaration clearly declared that they should be considered permanent residents of Hong Kong.
特區政府開門第一件事，便是香港永久居民在大陸子女的香港居留權問題，這些港人子女在香港有永久居留權，是因為「中英聯合聲明」中，訂明他們「為」香港永久居民。