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Now that the program is ready to validate with an XML Schema definition, it is necessary only to ensure that the XML document is associated with (at least) one.There are two ways to do that: , which stands for "XML Schema instance." The second line specifies the schema to use for elements in the document that do not have a namespace prefix-that is, for the elements you typically define in any simple, uncomplicated XML document.You also set a factory attribute to specify the parser language to use.(For SAX parsing, on the other hand, you set a property on the parser generated by the factory).This "unnamed namespace" (or "null namespace") is like the number zero.It does not have any value to speak of (no name), but it is still precisely defined.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.It is defined as the "namespace that has no name." So you cannot simply use one namespace as your default this week, and another namespace as the default later.
These are the same constants you define when using XML Schema for SAX parsing, and they are declared at the beginning of the Because JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work.Note that you cannot use the namespace prefixes when defining the schema locations.The static final String employee Schema = "employee Database.xsd"; static final String tax Schema = "w2Tax Form.xsd"; static final String hiring Schema = "hiring Form.xsd"; static final String schemas = ; static final String JAXP_SCHEMA_SOURCE = " Source"; // ...(You will see how to deal with multiple namespaces in the next section.) You can also specify the schema file in the application, which is the case for Here, too, there are mechanisms at your disposal that will let you specify multiple schemas. Namespaces let you combine elements that serve different purposes in the same document without having to worry about overlapping names.Note - The material discussed in this section also applies to validating when using the SAX parser.