code: Rule FieldHistory() {
  		return Sequence(String("H:"),
  				ZeroOrMore(WSP()).suppressNode(),
  				/*OneOrMoreS(*/TexText(), HeaderEol()/*)*/
  			).label(FieldHistory);
  	}
docs: field-history ::= %x48.3A *WSP 1*(tex-text header-eol)<p>
  <tt>H:</tt>
  field contents may extend over many lines, which is deprecated (maybe not allowed any longer?)