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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.relaxng.pattern;

import java.util.StringTokenizer;

class StringNormalizer {
  static String normalize(String s) {
    StringBuilder buf = new StringBuilder();
    for (StringTokenizer e = new StringTokenizer(s); e.hasMoreElements();) {
      if (buf.length() > 0)
        buf.append(' ');
      buf.append((String)e.nextElement());
    }
    return buf.toString();
  }
}