JiBX is an open-source Java framework for XML data binding. It solves the same problem as tools such as JAXB, XMLBeans and JDOM, but uses an alternate approach. It lets developers work with data from XML documents using arbitrarily defined Plain Old Java Objects (POJOs). The JiBX framework uses a binding definition to tell it how the Java objects map to the XML and vice versa. It is designed to perform the translation between internal data structures and XML with very high efficiency, and has been claimed to be the fastest XML data binding framework for Java.