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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.validate.mns;

import java.util.Hashtable;

class Hashset {
  private final Hashtable table = new Hashtable();

  boolean contains(Object key) {
    return table.get(key) != null;
  }

  void add(Object key) {
    table.put(key, key);
  }

  void clear() {
    table.clear();
  }
}