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  24 <a name="utilities-ucdn"></a>UCDN</h2></div></div></div>
  25 <p>
  26       HarfBuzz includes a copy of the <a class="ulink" href="https://github.com/grigorig/ucdn" target="_top">UCDN</a> (Unicode
  27       Database and Normalization) library, which provides functions
  28       for accessing basic Unicode character properties, performing
  29       canonical composition, and performing both canonical and
  30       compatibility decomposition.
  31     </p>
  32 <p>
  33       Currently, UCDN supports direct queries for several more character
  34       properties than HarfBuzz's built-in set of Unicode functions
  35       does, such as the BiDirectional Class, East Asian Width, Paired
  36       Bracket and Resolved Linebreak properties. If you need to access
  37       more properties than HarfBuzz's internal implementation
  38       provides, using the built-in UCDN functions may be a useful solution.
  39     </p>
  40 <p>
  41       The built-in UCDN functions are compiled by default when
  42       building HarfBuzz from source, but this can be disabled with a
  43       compile-time switch.
  44     </p>
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