Rule FieldSource() {
		return Sequence(String("S:"),
				ZeroOrMore(WSP()).suppressNode(),
				TexText(), HeaderEol()).label(FieldSource);
	}
Rule FieldSource ( ) { return Sequence ( String ( "S:" ) , ZeroOrMore ( WSP ( ) ) . suppressNode ( ) , TexText ( ) , HeaderEol ( ) ) . label ( FieldSource ) ; }
field-source ::= %x53.3A *WSP tex-text header-eol<p>
<tt>S:</tt>