Section One: The Concept of Public International Law In this section, we will study the definition of public international law (first), then the nature of public international law and the basis of its binding force (second), and finally the relationship between public international law and domestic law (third).A. Doctrinal Definition The definition of public international law has been studied from various perspectives.First: Definition of Public International Law Many doctrinal definitions of public international law have attempted to encompass the elements contained in the concept of public international law, and as this field has evolved, definitions have emerged that align with this development.These definitions connect international legal entities through international transactions, distinguishing them from public international law rules.