code: Rule IfieldTitle() {
  		return Sequence(String("[T:"),
  				ZeroOrMore(WSP()).suppressNode(),
  				TexTextIfield(),
  				String("]"))
  			.label(IfieldTitle);
  	}
docs: ifield-title ::= %5B.%54.%3A *WSP tex-text-ifield %5D<p>
  <tt>[T:second version]</tt>