private Set<TKey<?, ?>> setupPortalKeys() {
        Set<TKey<?, ?>> portalKeys = new HashSet<>();

        portalKeys.add(DatasetKeys.PORTAL_STATUS);
        portalKeys.add(DatasetKeys.LINK);
        portalKeys.add(DatasetKeys.NOTE);

        validQualifiers.put(DatasetKeys.LINK, new HashSet<Class<? extends Enum<?>>>() {
            {
                add(DatasetQualifiers.LINK_TYPE);
            }
        });
        validQualifiers.put(DatasetKeys.NOTE, new HashSet<Class<? extends Enum<?>>>() {
            {
                add(DatasetQualifiers.NOTE_TYPE);
            }
        });
        
        qualifiers.add(DatasetQualifiers.LINK_TYPE);
        qualifiers.add(DatasetQualifiers.NOTE_TYPE);

        uniqueKeys.add(DatasetKeys.PORTAL_STATUS);

        return portalKeys;
    }