code: @Override
      public StatementGroup convert(XBELStatementGroup source) {
          if (source == null) return null;
  
          // Destination type
          StatementGroup dest = new StatementGroup();
  
          XBELAnnotationGroup annotationGroup = source.getAnnotationGroup();
          AnnotationGroupConverter agConverter = new AnnotationGroupConverter();
          // Defer to AnnotationGroupConverter
          AnnotationGroup ag = agConverter.convert(annotationGroup);
          dest.setAnnotationGroup(ag);
  
          String name = source.getName();
          dest.setName(name);
  
          String comment = source.getComment();
          dest.setComment(comment);
  
          List<XBELStatement> xstatements = source.getStatement();
          int size = xstatements.size();
          List<Statement> statements = new ArrayList<Statement>(size);
          StatementConverter sConverter = new StatementConverter();
          for (final XBELStatement xstmt : xstatements) {
              // Defer to StatementConverter
              statements.add(sConverter.convert(xstmt));
          }
          dest.setStatements(statements);
  
          List<XBELStatementGroup> xstmtGroup = source.getStatementGroup();
          size = xstmtGroup.size();
          List<StatementGroup> stmtGroup = new ArrayList<StatementGroup>(size);
          for (final XBELStatementGroup xsg : xstmtGroup) {
              stmtGroup.add(convert(xsg));
          }
          dest.setStatementGroups(stmtGroup);
  
          return dest;
      }
docs: {@inheritDoc}