core:
import edu.neu.ccs.demeter.dj.*;
import java.util.*;
import java.lang.reflect.*;

import edu.neu.ccs.demeter.*;
add: class Nonempty_Vertex_Comma_list {
  protected Vertex it;
  public Vertex get_it() {{ return it; }}
  public void set_it(Vertex new_it)
    {{ it = new_it; }}
  protected Nonempty_Vertex_Comma_list next;
  public Nonempty_Vertex_Comma_list get_next() {{ return next; }}
  public void set_next(Nonempty_Vertex_Comma_list new_next)
    {{ next = new_next; }}
  public constructor Nonempty_Vertex_Comma_list() {{ super(); }}
  public constructor Nonempty_Vertex_Comma_list(Vertex it, Nonempty_Vertex_Comma_list next) {{
    super();
    set_it(it);
    set_next(next);
  }}
  public static Nonempty_Vertex_Comma_list parse(java.io.Reader in)
    throws ParseException
  {{ return new Parser(in)._Nonempty_Vertex_Comma_list(); }}
  public static Nonempty_Vertex_Comma_list parse(java.io.InputStream in)
    throws ParseException
  {{ return new Parser(in)._Nonempty_Vertex_Comma_list(); }}
  public static Nonempty_Vertex_Comma_list parse(String s) {{
    try { return parse(new java.io.StringReader(s)); }
    catch (ParseException e) {
      throw new RuntimeException(e.toString());
    }
  }}
{{  void universal_trv0_bef(UniversalVisitor _v_) {
    ((UniversalVisitor) _v_).before(this);
  }
}}
{{  void universal_trv0_aft(UniversalVisitor _v_) {
    ((UniversalVisitor) _v_).after(this);
  }
}}
{{  void universal_trv0(UniversalVisitor _v_) {
    universal_trv0_bef(_v_);
    ((UniversalVisitor) _v_).before_it(this, it);
    it.universal_trv0(_v_);
    ((UniversalVisitor) _v_).after_it(this, it);
    if (next != null) {
      ((UniversalVisitor) _v_).before_next(this, next);
      next.universal_trv0(_v_);
      ((UniversalVisitor) _v_).after_next(this, next);
    }
    universal_trv0_aft(_v_);
  }
}}
{{  void __trav_display_Cd_graph_trv_bef(DisplayVisitor __v0) {
    ((DisplayVisitor) __v0).before(this);
  }
}}
{{  void __trav_display_Cd_graph_trv_aft(DisplayVisitor __v0) {
    ((DisplayVisitor) __v0).after(this);
  }
}}
{{  void __trav_display_Cd_graph_trv(DisplayVisitor __v0) {
    __trav_display_Cd_graph_trv_bef(__v0);
    ((DisplayVisitor) __v0).before_it(this, it);
    it.__trav_display_Cd_graph_trv(__v0);
    ((UniversalVisitor) __v0).after_it(this, it);
    if (next != null) {
      ((DisplayVisitor) __v0).before_next(this, next);
      next.__trav_display_Cd_graph_trv(__v0);
      ((UniversalVisitor) __v0).after_next(this, next);
    }
    __trav_display_Cd_graph_trv_aft(__v0);
  }
}}
}