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Both of these parsers are provided by Java API for XML Processing (JAXP).
Java developers can invoke a SAX or DOM parser in an application through the JAXP API to parse an XML document -- that is, scan the document and logically break it up into discrete pieces.
XML and Java technology are recognized as ideal building blocks for developing Web services and applications that access Web services. More specifically, how do you access and use an XML document (that is, a file containing XML-tagged data) through the Java programming language?
One way to do this, perhaps the most typical way, is through parsers that conform to the Simple API for XML (SAX) or the Document Object Model (DOM).
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.In addition, pre-release versions of the JAXB Reference Implementation worked only with DTDs -- that is, not with schemas written in the XML Schema Language.