@MappedSuperclass
public class Thing extends AbstractPersistable<Long> {
	@org.hibernate.validator.constraints.URL
	private URL url ;
	private URL additionalType ;
	private String alternateName ;

	@Column(length = 255)
	private String description ;
	@Column(length=255)
	private String name ;
	@org.hibernate.validator.constraints.URL
	private URL sameAs ;
	@Version
	private Integer version ;
	@Temporal(TemporalType. TIMESTAMP )
	private Date createdDate = new Date();
	@Temporal(TemporalType. TIMESTAMP )
	private Date lastmodifiedDate = new Date();

	public URL getAdditionalType() {
		return additionalType ;
	}

	public void setAdditionalType(URL additionalType) {
		this.additionalType = additionalType;
	}