I was reading about internationalization over at
http://codex.wordpress.org/I18n_for_WordPress_Developers
To me the codex is a little unclear. What should literally go where it says my-text-domain? Does WP have a build in variable or something to use here? Maybe I'm wrong, but I don't think literally declaring my-text-domain is correct. Am I wrong? What should be declared? Is there a better resource with more details over this somewhere other than the link I provided?