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That's because XML has emerged as the standard for exchanging data across disparate systems, and Java technology provides a platform for building portable applications.
This partnership is particularly important for Web services, which promise users and application developers program functionality on demand from anywhere to anywhere on the Web.
Both of these parsers are provided by Java API for XML Processing (JAXP).
Suppose you need to develop a Java application that accesses and displays data in XML documents such as
Now developers have another Java API at their disposal that can make it easier to access XML documents: Java Architecture for XML Binding (JAXB).
A Reference Implementation of the API is now available in the Java Web Services Developer Pack V 1.1.
Schema: A schema is an XML specification that governs the allowable components of an XML document and the relationships between the components.
For example, a schema identifies the elements that can appear in an XML document, in what order they must appear, what attributes they can have, and which elements are subordinate (that is, are child elements) to other elements.