EDIT

	@XmlIDREF

	@XmlSchemaType(name = "IDREF")

	@ManyToOne(fetch = FetchType.LAZY)

	private Taxon taxonomicParentCache;

	@XmlElementWrapper(name = "taxonNodes")

	@XmlElement(name = "taxonNode")

    //@XmlIDREF

	//cached number of taxonomic children

	@XmlElement(name = "TaxonomicChildrenCount")

	private int taxonomicChildrenCount;

// ************* CONSTRUCTORS *************/	

	 * @see    	   			#getTaxonomicParent()

	 * @see    	   			#getTaxonomicChildrenCount()

	 */

	public void addTaxonomicChild(Taxon child, ReferenceBase citation, String microcitation){

		if (child == null){

			throw new NullPointerException("Child Taxon is 'null'");

	 * @see    			eu.etaxonomy.cdm.model.common.RelationshipBase#getRelatedTo()

	 * 

	 */

	public void removeTaxonomicChild(Taxon child){

		Set<TaxonRelationship> taxRels = this.getTaxonRelations();

		for (TaxonRelationship taxRel : taxRels ){

	 * @see  #getTaxonomicChildrenCount()

	 * @see  #getRelationsFromThisTaxon()

	 */

	public Taxon getTaxonomicParent() {

		return this.taxonomicParentCache;

	}

	 * Sets the taxononomic parent of <i>this</i> taxon to null.

	 * Note that this method does not handle taxonomic relationships.

	 */

	public void nullifyTaxonomicParent() {

		this.taxonomicParentCache = null;

	}

	 * @see    	   			#getRelationsToThisTaxon()

	 * @see    	   			#getTaxonomicChildrenCount()

	 */

	public void setTaxonomicParent(Taxon newParent, ReferenceBase citation, String microcitation){

		//remove previously existing parent relationship!!!

		Taxon oldParent = this.getTaxonomicParent();

	 * @see  #getRelationsToThisTaxon()

	 */

	@Transient

	public Set<Taxon> getTaxonomicChildren() {

		Set<Taxon> taxa = new HashSet<Taxon>();

		Set<TaxonRelationship> rels = this.getRelationsToThisTaxon();

	 * @see  #getTaxonomicChildren()

	 * @see  #getRelationsToThisTaxon()

	 */

	public int getTaxonomicChildrenCount(){

		return taxonomicChildrenCount;

	}	

	/**

	 * @see  #getTaxonomicChildrenCount()

	 */

	public void setTaxonomicChildrenCount(int taxonomicChildrenCount) {

		this.taxonomicChildrenCount = taxonomicChildrenCount;

	}

	 * @see  #getTaxonomicChildrenCount()

	 * @see  #getTaxonomicChildren()

	 */

	public boolean hasTaxonomicChildren(){

		return this.taxonomicChildrenCount > 0;

	}

	private int computeTaxonomicChildrenCount(){

		int count = 0;

		for (TaxonRelationship rel: this.getRelationsToThisTaxon()){