An experimental RELAX NG schema for XUL, based on http://xulplanet.com/references/elemref/ (as of 2003-03-27) This is quite incomplete, a lot of guesswork is involved. start end center none left right always never shift alt meta control accel after_start after_end before_start before_end end_after end_before start_after start_before overlap at_pointer after_pointer start center end baseline stretch left center right true false true false true false true false true false true false ltr rtl true false always never dont-test-empty dont-build-content hidden horizontal vertical start center end horizontal vertical start center end baseline stretch left center right true false true false true false true false true false true false ltr rtl true false always never dont-test-empty dont-build-content hidden start center end true false true accept cance help disclosure checkbox menu menu-button radio true false true button true true false true rtl ltr horizontal vertical defer preserve true false true false true single multiple true false true false true checkbox true true true false true checkbox radio true false determined undetermined true true false true topleft top topright left right bottomleft bottomright true false true false true decrement increment none before after closest farthest grow closest farthest true true false true false true true false true false true false password autocomplete text true true false true false small icons text full true small icons text full true false true false true false single multiple true false true false true false true false ascending descending natural true false maximized minimized normal