Validating xml with dtd in java

When parsed, each element in the data set will be validated against the appropriate schema, as long as those schemas have been declared.

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To contrive an example, consider an XML data set that keeps track of personnel data.

The data set may include information from a tax declaration form as well as information from the employee's hiring form, with both elements named Note - The default namespace is actually a specific namespace.

At the end of this section, you will also learn how to use an XML Schema definition to validate a document that contains elements from multiple namespaces.

To be notified of validation errors in an XML document, the following must be true: It is helpful to start by defining the constants you will use when configuring the factory.

To report errors, it is necessary to provide an Error Handler to the underlying implementation.

The Error Handler used for the examples is a very simple one which reports the error to and continues until the XML document has been fully parsed or until a fatal-error has been reported.

Many Java XML APIs provide mechanisms to validate XML documents, the JAXP API can be used for most of these XML APIs but subtle configuration differences exists.

This article shows five ways of how to configure different Java APIs (including DOM, SAX, dom4j and XOM) using JAXP 1.3 for checking and validating XML with DTD and Schema(s).

Although a full treatment of XML Schema is beyond the scope of this tutorial, this section shows you the steps you take to validate an XML document using an XML Schema definition.

(To learn more about XML Schema, you can review the online tutorial, XML Schema Part 0: Primer.

declaration consists of entry pairs, where the first entry in each pair is a fully qualified URI that specifies the namespace, and the second entry contains a full path or a relative path to the schema definition. In that way, only one copy of the schema will tend to exist.

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