[NTG-context] DTD or similar for export file?

Hi. I'm playing with 'export' and wonder is there 'official' DTD or something similar for 'export' file? P.S. I'm trying to figure out how to write notes using context and export them into (x)html. Currently I'm happy with default xhtml produced by context but want to get 'real' xhtml. --- TIA, Vladimir Lomov -- What a misfortune to be a woman! And yet, the worst misfortune is not to understand what a misfortune it is. -- Kierkegaard, 1813-1855.