XBELStatement xstmt = new XBELStatement();
Term subject = source.getSubject();
TermConverter tConverter = new TermConverter();
XBELSubject xs = new XBELSubject();
// Defer to TermConverter
xs.setTerm(tConverter.convert(subject));
xstmt.setSubject(xs);
AnnotationGroup ag = source.getAnnotationGroup();
AnnotationGroupConverter agConverter = new AnnotationGroupConverter();
// Defer to AnnotationGroupConverter