TY JOUR TI ACTS OF “SOFT” LAW AS REGULATORS OF PRIVATE LAW RELATIONS KW Transnational character KW source of law KW Hague Principles KW European Principles KW UNIDROIT Principles KW code of rules KW regulators KW private-law relations KW “soft” law KW model rules. JO Journal of Foreign Legislation and Comparative Law AU Sergeeva, O.V. PY 2015 IS 1 PB Legal publishing house Norm