A/HRC/19/21 review. The webpage was recently upgraded and is now available in all official languages of the United Nations. 2. Progressive development of international human rights law 21. OHCHR continued to support the standard-setting activities of the United Nations human rights system. 22. OHCHR continued to draw attention to human rights violations, including violence and discrimination, perpetrated against individuals on the basis of their sexual orientation or gender identity. In this regard, the Human Rights Council requested the Office to commission a study on relevant discriminatory laws and practices and acts of violence. 23. The General Assembly adopted the Optional Protocol to the Convention on the Rights of the Child, permitting the Committee on the Rights of the Child to receive individual communications. When article 14 of the International Convention on the Protection of All Migrant Workers and Members of Their Families and the Optional Protocol to the International Covenant on Economic, Social and Cultural Rights come into force, all treaty bodies will be able to receive individual communications – a significant step forward in improving human rights protection. The Office is supporting developments in the General Assembly aimed at strengthening the human rights of older persons. 24. The Human Rights Committee adopted its general comment No. 34 on freedoms of opinion and expression, providing the most up-to-date understanding of these freedoms in the light of the Committee's considerable jurisprudence in this area. 25. OHCHR organized an expert meeting on the legal framework required to prohibit, prevent and respond to all forms of violence against children, and a consultation with stakeholders on children working or living on the street. 26. My Office provided support for the Special Representative of the Secretary-General on the issue of human rights and transnational corporations and other business enterprises in the preparation of the Guiding Principles on Business and Human Rights, which were endorsed by the Human Rights Council in its resolution 17/4. We supported the launch of the Working Group on the issue of human rights and transnational corporations and other business enterprises. To support the effective implementation of the Guiding Principles, OHCHR produced an interpretive guide on the corporate responsibility to respect human rights. Jointly with the Global Compact Office, OHCHR produced a revised online learning tool on business and human rights and a guide for business enterprises on the development of corporate human rights policies. 27. OHCHR continued to support the intergovernmental Open-ended Working Group on the Right to Development, including through follow-up to the recommendations made at its twelfth session, held in November 2011. 28. The Office facilitated the initiative of the Human Rights Council to develop a United Nations Declaration on Human Rights Education and Training, and provided support for its open-ended working group. 29. OHCHR continued to strengthen cooperation with regional human rights organizations. We supported the development of human rights mechanisms for the Association of Southeast Asian Nations. 30. The Office advised the African Commission on Human and Peoples’ Rights in the elaboration of its Principles and Guidelines on Economic, Social and Cultural Rights, which were adopted in October. In November, a regional workshop was organized with the Organization of American States, in particular the Inter-American Court of Human Rights, with a focus on the prevention of torture and the protection of its victims. 6