code: public void accept(XVisitor visitor, XLog log) {
  		/*
  		 * First call.
  		 */
  		visitor.visitExtensionPre(this, log);
  		/*
  		 * Last call.
  		 */
  		visitor.visitExtensionPost(this, log);
  	}
docs: /*
  Runs the given visitor for the given log on this extension.