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

import edu.neu.ccs.demeter.*;
add: class Regular_syntax extends Syntax_vertex {
  protected String string;
  public String get_string() {{ return string; }}
  public void set_string(String new_string)
    {{ string = new_string; }}
  public constructor Regular_syntax() {{ super(); }}
  public constructor Regular_syntax(String string) {{
    super();
    set_string(string);
  }}
  public static Regular_syntax parse(java.io.Reader in)
    throws ParseException
  {{ return new Parser(in)._Regular_syntax(); }}
  public static Regular_syntax parse(java.io.InputStream in)
    throws ParseException
  {{ return new Parser(in)._Regular_syntax(); }}
  public static Regular_syntax 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_) {
    super.universal_trv0_bef(_v_);
    ((UniversalVisitor) _v_).before(this);
  }
}}
{{  void universal_trv0_aft(UniversalVisitor _v_) {
    ((UniversalVisitor) _v_).after(this);
    super.universal_trv0_aft(_v_);
  }
}}
{{  void universal_trv0(UniversalVisitor _v_) {
    universal_trv0_bef(_v_);
    ((UniversalVisitor) _v_).before_string(this, string);
    ((UniversalVisitor) _v_).after_string(this, string);
    super.universal_trv0(_v_);
    universal_trv0_aft(_v_);
  }
}}
{{  void __trav_display_Cd_graph_trv_bef(DisplayVisitor __v0) {
    super.__trav_display_Cd_graph_trv_bef(__v0);
    ((DisplayVisitor) __v0).before(this);
  }
}}
{{  void __trav_display_Cd_graph_trv_aft(DisplayVisitor __v0) {
    ((DisplayVisitor) __v0).after(this);
    super.__trav_display_Cd_graph_trv_aft(__v0);
  }
}}
{{  void __trav_display_Cd_graph_trv(DisplayVisitor __v0) {
    __trav_display_Cd_graph_trv_bef(__v0);
    ((DisplayVisitor) __v0).before_string(this, string);
    ((UniversalVisitor) __v0).after_string(this, string);
    super.__trav_display_Cd_graph_trv(__v0);
    __trav_display_Cd_graph_trv_aft(__v0);
  }
}}
}