rule document { <prolog> <element> <Misc>* }
rule Char     { <[\x9\xA\xD\x20-\xD7FF\xE000\xFFFD\x10000-\x10FFFF]> }
rule S        { <[\x20\x9\xD\xA]>+ }
rule NameChar { <Letter> | <Digit> | <[._:-]> | <CombiningChar> | <Extender> }
rule Name     { [ <Letter | <[_:]> ] <NameChar>* }
rule Names    { <Name> [<S> <Name>]* }

rule Nmtoken  { <NameChar>+ }
rule Nmtokens { <Nmtoken> [<S> <Nmtoken>]* }
etcetera, etcetera