yes no { } ( ) grammar start |= &= = div include { } external inherit = .rnc local inh parent { text } ? * + text empty notAllowed { = } - " '"' " \x{A} \x{D} ''' token string token xsd: xsd: : true true true true [ ] local inh :* * - ( ) | ( ) : : attribute default datatypes div element empty external grammar include inherit list mixed namespace notAllowed parent start string text token \ >> : = [ = ]