code: public Collection<XAttribute> getAttributesForType(Class<? extends XAttribute> type) {
  		Set<XAttribute> typeSet = typeMap.get(type);
  		if(typeSet == null) {
  			typeSet = new HashSet<XAttribute>(0);
  		}
  		return Collections.unmodifiableCollection(typeSet);
  	}
docs: /* (non-Javadoc)
  @see org.deckfour.xes.summary.XAttributeInfo#getAttributesForType(org.deckfour.xes.model.XAttribute.Type)