code: protected boolean semanticallyEquivalent(BioPAXElement o)
  	{
  		if (o!= null && o instanceof openControlledVocabulary)
  		{
  			openControlledVocabulary that =
  				(openControlledVocabulary) o;
  
  			return
  				this.equals(that) ||
  				hasCommonTerm(that) ||
  				!this.findCommonUnifications(that).isEmpty();
  		}
  		return false;
  	}
docs: TODO: think about this.
  
  @return false