OBS_VALUE: <ul><li><a href=https://www.wto.org/english/tratop_e/serv_e/jsdomreg_e.htm target=_blank>WTO official website(Declaration on the conclusion of negotiations on services domestic regulation of 2 December 2021, Annex 1)</a></li><li><a href=https://docs.wto.org/dol2fe/Pages/FE_Search/FE_S_S006.aspx?DataSource=Cat&query=@Symbol=%22GATS/SC/76/Suppl.4%22%20OR%20@Symbol=%22GATS/SC/76/Suppl.4/*%22&Language=English&Context=ScriptedSearches&languageUIChanged=true target=_blank>WTO official website(Trade in Services - Singapore - Schedule of Specific Commitments - Supplement 4)</a></li></ul>