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There is no fixed set of unambiguous terms that are used to indicate a person's gender identity. Furthermore, it is unrealistic to expect that there ever will be. Some terms are used differently by different communities of persons. For example, a transgender man may consider "transgender" to be part of his gender identity. Alternatively, he may consider his gender to "male" and regard "transgender" as part of his gender history. Imposing a standard vocabulary in either case would not be appropriate insofar as it could engender an atmosphere of proscribing gender identities, and what we are interested in is managing documented gender identities.
Furthermore, the language used to descirbe gender identities is both community specific and constantly changing. In the past the word "queer" has been used in a derogatory sense. However, some communities are reclaiming it. "Gender fluid", "gender non-conforming", "gender varient" are all terms that can have specific meanings in specific communities. Similarly, some individuals consider themselves to be trans-feminine, but would not identify as women or females. In order to accommodate the fact that specific gender identities will vary from community to community and over time, I propose that we take an approach to gender identities that is similar to that taken in the proper name ontology.
The proper name ontology is designed to be able to accommodate different cultural conventions of naming by remaining very general and allowing the user to extend the ontology with different subtypes of names. Similarly, I propose that we do not attempt to include a comprehensive list of gender identities, and encourage end users to extend the ontology to include the kind of gender identities that are appropriate for the community they are working with. In the same way that the proper name ontology facilitates interoperability by providing an ontology at the general level, the account of gender identity in OMRSE should facilitate interoperability by providing a general framework for gender identity acts. How to best achieve this still needs to be investigated, but I think that this is the best approach.