spec header front body back title subtitle version w3c-designation w3c-doctype pubdate notice publoc prevlocs latestloc authlist copyright status abstract pubstmt sourcedesc langusage revisiondesc day month year p ednote ulist olist slist glist example loc attval att el var function code xnt nt kw xtermref xspecref titleref termref specref bibref sup sub quote phrase emph term termdef proto definitions note footnote orglist blist issue wfcnote vcnote constraintnote eg graphic scrap table head name date edtext arg typedef constant exception reference group module interface