Open Justice Ontology (OJO) develops a rule of law (RoL) semantic juridic we of justice system controlled vocabularies for the establishment of public international law (PIL) open source regulatory compliance. It was developed from years of international law integration (ILI) public and nonprofit policymaking and compiled due to an invitation of the University of Pennsylvania (UPenn) Wharton School Legal Studies and Business Ethics Department to peer review and mediate in its Normative Philosophy Conference. Its main aim is to establish open justice and open source technologies as the foundation of open courts and open law.