title: Definition of the CESS_ESP tags
body: <p>I'm using the <a href="http://www.nltk.org/" rel="nofollow">NLTK</a> CESS ESP data package and I've been able to use an adatpation
  of the <a href="https://code.google.com/p/spaghetti-tagger/" rel="nofollow">spaghetti tagger</a> and a <code>HiddenMarkovModelTagger</code> to pos-tag the sentence, how ever the tags that it produces are not at all like the ones used when tagging en_US sentences, here's a link to the <a href="http://www.nltk.org/book/ch05.html" rel="nofollow">Categorizing and Tagging</a> documentation for NLTK, you'll notice that the tags used are uppercase and don't have any numbers or punctuation, some cess tags: <code>vsip3s0</code>, <code>da0fs0</code>.</p>
  
  <p>Does some one know a reference that explains those tags?</p>
  
  <h2>Sentence</h2>
  
  <blockquote>
    <p>¿Que es la programación orientada a objetos?</p>
  </blockquote>
  
  <h2>Spaghetti Tagger</h2>
  
  <pre><code>[('\xc2\xbfQue', None), ('es', 'vsip3s0'), ('la', 'da0fs0'), ('programaci\xc3\xb3n', None), ('orientada', 'aq0fsp'), ('a', 'sps00'), ('objetos', 'ncmp000'), ('?', 'Fit')]
  [('\xc2\xbfQue', None), ('es', None), ('la', None), ('programaci\xc3\xb3n', None), ('orientada', None), ('a', None), ('objetos', None), ('?', None)]
  [('\xc2\xbfQue', None), ('es', 'vsip3s0'), ('la', 'da0fs0'), ('programaci\xc3\xb3n', None), ('orientada', 'aq0fsp'), ('a', 'sps00'), ('objetos', 'ncmp000'), ('?', 'Fit')]
  [('\xc2\xbfQue', None), ('es', 'vsip3s0'), ('la', 'da0fs0'), ('programaci\xc3\xb3n', None), ('orientada', 'aq0fsp'), ('a', 'sps00'), ('objetos', 'ncmp000'), ('?', 'Fit')]
  </code></pre>
  
  <h2>Markov Tagger</h2>
  
  <pre><code>[('\xc2\xbfQue', 'sn.e-SUJ'), ('es', 'vsip3s0'), ('la', 'da0fs0'), ('programaci\xc3\xb3n', 'ncfs000'), ('orientada', 'aq0fsp'), ('a', 'sps00'), ('objetos', 'ncmp000'), ('?', 'Fit')]
  </code></pre>