In 2006, a distinguished group of international human rights experts met in Yogyakarta, Indonesia to outline a set of international principles relating to sexual orientation and gender identity. The result was the Yogyakarta Principles: a universal guide to human rights which affirm binding international legal standards with which all States must comply.
The Yogyakarta Principles recognise gender identity to refer to each person’s deeply felt internal and individual experience of gender, which may or may not correspond with the sex assigned at birth, including the personal sense of the body (which may involve, if freely chosen, modification of bodily appearance or function by medical, surgical or other means) and other expressions of gender, including dress, speech and mannerisms.
The Yogyakarta Princples can be read at: http://www.yogyakartaprinciples.org