syntax RuleAttribute
{
  | Start                  = AttributeName="StartRule"
  | SpanClass              = AttributeName="SpanClass" "(" Class=Identifier ")"
  | ExplicitSpaces         = AttributeName="ExplicitSpaces"
  | ImplicitSpaces         = AttributeName="ImplicitSpaces"
  | SuppressTrailingSpaces = AttributeName="SuppressTrailingSpaces"
  | AllowTrailingSpaces    = AttributeName="AllowTrailingSpaces"
  | NoAst                  = AttributeName="NoAst"
  | KeyToken               = AttributeName="Key"
}

Attributes of the rules.