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A branch of Jing used by the Nu Html Checker. (Jing is a tool for validating documents against RelaxNG schemas.)

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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();
  }
}