code: Rule XcomMeasurenb() {
  		return FirstOf(String("measurenb"),
  				String("measurebox"),
  				String("measurefirst"),
  				Sequence(String("setbarnb"),
  						OneOrMore(WSP()), OneOrMore(DIGIT())))
  			.label(XcomMeasurenb);
  	}
docs: xcom-measurenb ::= "measurenb" / "measurebox" / "measurefirst"
  / ("setbarnb" 1*WSP 1*DIGIT)