org.hibernate.tuple.Tuplizer是用来干什么的?

 * A tuplizer defines the contract for things which know how to manage
 * a particular representation of a piece of data, given that
 * representation's {@link org.hibernate.EntityMode} (the entity-mode
 * essentially defining which representation).
 * </p>
 * If that given piece of data is thought of as a data structure, then a tuplizer
 * is the thing which knows how to<ul>
 * <li>create such a data structure appropriately
 * <li>extract values from and inject values into such a data structure
 * </ul>
 * </p>
 * For example, a given piece of data might be represented as a POJO class.
 * Here, it's representation and entity-mode is POJO.  Well a tuplizer for POJO
 * entity-modes would know how to<ul>
 * <li>create the data structure by calling the POJO's constructor
 * <li>extract and inject values through getters/setter, or by direct field access, etc
 * </ul>
 * </p>
 * That same piece of data might also be represented as a DOM structure, using
 * the tuplizer associated with the DOM4J entity-mode, which would generate instances
 * of {@link org.dom4j.Element} as the data structure and know how to access the
 * values as either nested {@link org.dom4j.Element}s or as {@link org.dom4j.Attribute}s.

看了上面的注释也是糊里糊涂的.有这方面资料吗?