public Collection<String> getKeysForExtension(XExtension extension) {
		Collection<XAttribute> extensionCollection = getAttributesForExtension(extension);
		Set<String> keySet = new HashSet<String>();
		for(XAttribute attribute : extensionCollection) {
			keySet.add(attribute.getKey());
		}
		return Collections.unmodifiableCollection(keySet);
	}
public Collection < String > getKeysForExtension ( XExtension extension ) { Collection < XAttribute > extensionCollection = getAttributesForExtension ( extension ) ; Set < String > keySet = new HashSet < String > ( ) ; for ( XAttribute attribute : extensionCollection ) { keySet . add ( attribute . getKey ( ) ) ; } return Collections . unmodifiableCollection ( keySet ) ; }
/* (non-Javadoc)
@see org.deckfour.xes.summary.XAttributeInfo#getKeysForExtension(org.deckfour.xes.extension.XExtension)