code: public int getLeftIndexFromSNode(SSpan s) 
    {
      
      RelannisNodeFeature feat = 
        (RelannisNodeFeature) s.getFeature(SaltUtil.createQName(ANNIS_NS, FEAT_RELANNIS_NODE)).getValue();
      return (int) feat.getLeftToken();
    }
docs: Get the most left token index of a SSpan.