The XML schema document is an XML document that defines a set of valid XML documents.
A well-formed XML document follows the rules of the XML specification. A valid XML document conforms to a particular XML schema.
XML schemas define data models. XML data binding technologies use data models to translate XML document instances into native data objects. Some of the XML data binding technologies are Castor, JAXB, and XMLBeans (http://xmlbeans.apache.org).
XPath is a language for finding information in XML documents. XPath uses path expressions to navigate XML. XPath is a W3C standard (http://www.w3.org/TR/xpath).
XQuery is often referred as "SQL for XML". XQuery leverages XPath expressions. http://www.w3.org/TR/xquery. The XMLBeans API provides execQuery method for executing XQuery expressions. An XMLBean can be transformed into another XMLBean using XQuery.
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