code: @Override
      public Object jjtAccept(SMARTSParserVisitor visitor, Object data) {
          return visitor.visit(this, data);
      }
docs: /*
  (non-Javadoc)
  @see
  org.openscience.cdk.smiles.smarts.parser.SimpleNode#jjtAccept(org.openscience
  .cdk.smiles.smarts.parser.SMARTSParserVisitor, java.lang.Object)