tr&#39; must be written in CRF++&#39;s input format</span>
<a name="l00314"></a>00314   <span class="keyword">virtual</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* parse(<span class="keyword">const</span> <span class="keywordtype">char</span>* str) = 0;
<a name="l00315"></a>00315 
<a name="l00316"></a>00316 <span class="preprocessor">#ifndef SWIG</span>
<a name="l00317"></a>00317 <span class="preprocessor"></span>  <span class="comment">// return parsed result as string</s