return canonicalForm.hashCode();
  }

  /**
   * Returns a string representation of the host specifier suitable for inclusion in a URI. If the
   * host specifier is a domain name, the string will be normalized to all lower case. If the
   * specifier was an IPv6 address without brackets, brackets are added so that the result will be
   * usable in the host part of a URI.
   */
  @Override
  public String toString() {

   * Returns an {@link Escaper} instance that escapes special characters in a string so it can
   * safely be included in XML document as an attribute value. See section <a
   * href="http://www.w3.org/TR/2008/REC-xml-20081126/#AVNormalize">3.3.3</a> of the XML
   * specification.
   *
   * <p>This escaper substitutes {@code 0xFFFD} for non-whitespace control characters and the