code: protected Set<String> getIdentifiers(Match m, String label)
  	{
  		BioPAXElement el = m.get(label, getPattern());
  
  		if (idFetcher != null) return idFetcher.fetchID(el);
  
  		Set<String> set = new HashSet<String>();
  		if (el instanceof ProteinReference)
  		{
  			set.add(getGeneSymbol((ProteinReference) el));
  		}
  		else if (el instanceof SmallMoleculeReference)
  		{
  			set.add(getCompoundName((SmallMoleculeReference) el));
  		}
  
  		return set;
  	}
docs: Uses uniprot name or gene symbol as identifier.
  @param m current match
  @param label label of the related EntityReference in the pattern
  @return identifier