EDIT

import javax.persistence.Lob;

import javax.persistence.ManyToOne;

import javax.persistence.Transient;

import javax.validation.constraints.Pattern;

import javax.xml.bind.annotation.XmlAccessType;

import javax.xml.bind.annotation.XmlAccessorType;

import eu.etaxonomy.cdm.strategy.parser.ParserProblem;

import eu.etaxonomy.cdm.validation.Level2;

import eu.etaxonomy.cdm.validation.annotation.NullOrNotEmpty;

/**

 * The upmost (abstract) class for references (information sources). 

@Audited

@javax.persistence.Table(name="Reference")

@Table(appliesTo="Reference", indexes = { @org.hibernate.annotations.Index(name = "ReferenceTitleCacheIndex", columnNames = { "titleCache" }) })

//public abstract class Reference<S extends IReferenceBaseCacheStrategy> extends IdentifiableMediaEntity<S> implements IParsable, IMergable, IMatchable, IArticle, IBook, IJournal, IBookSection,ICdDvd,IGeneric,IInProceedings, IProceedings, IPrintSeries, IReport, IThesis,IWebPage {

public class Reference<S extends IReferenceBaseCacheStrategy> extends IdentifiableMediaEntity<S> implements INomenclaturalReference, IArticle, IBook, IPatent, IDatabase, IJournal, IBookSection,ICdDvd,IGeneric,IInProceedings, IProceedings, IPrintSeries, IReport, IThesis,IWebPage, IPersonalCommunication, IReference, Cloneable {

	private static final long serialVersionUID = -2034764545042691295L;

	@Lob

	@Field(index=Index.TOKENIZED)

	@Match(MatchMode.EQUAL_REQUIRED)

	@Length(max = 4096)

	private String title;

//    @IndexedEmbedded

    @Cascade(CascadeType.SAVE_UPDATE)

   	protected Reference inReference;

//    @XmlElement(name = "FullReference")

	@Length(max = 65536)

	private String referenceAbstract;  //abstract is a reserved term in Java

	//URIs like DOIs, LSIDs or Handles for this reference

	@XmlElement(name = "URI")

	@Field(index=org.hibernate.search.annotations.Index.UN_TOKENIZED)

	@Type(type="uriUserType")

	private URI uri;