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Plain Old XML (POX) is a term used to describe basic XML , sometimes mixed in with other, blendable specifications like XML Namespaces , Dublin Core , XInclude and XLink . People typically use the term as a contrast with complicated, multilayered XML specifications like those for Web Services or RDF .

An interesting question is how POX relates to XML Schema . On the one hand, POX is completely compatible with XML Schema. However, many POX users eschew XML Schema to avoid the poor/inconsistent quality of XML Schema-to-Java tools.

POX is different from REST in that the latter refers to a style for communication protocols, while the former only refers to an information format style. REST could be seen as POX over HTTP with some pecularities.