Zhang Dejiang (R, front), chairman of the Standing Committee of the National People's Congress (NPC), attends a high-ranking symposium commemorating the 20th anniversary of implementing the Basic Law of the Hong Kong Special Administrative Region (HKSAR), at the Great Hall of the People in Beijing, capital of China, May 27, 2017. [Photo/Xinhua]

Addressing the symposium, which was held at the Great Hall of the People in Beijing, top legislator Zhang Dejiang called for comprehensive and precise implementation of the principle of "one country, two systems" and the Basic Law.

Zhang, chairman of the Standing Committee of the National People's Congress (NPC), called the HKSAR Basic Law "a product of ingenuity of a great era," which fully embodies the shared desire of all Chinese including Hong Kong compatriots and has demonstrated great vitality.