The default response from a schema is to throw a to receive more detailed information about the document's problems.For example, suppose you want to log all validation errors, but you don't want to stop processing when you encounter one.However, it's usually done before any further processing of the input takes place.
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You can also tell whether and how a type is derived from another type.
Beyond that, understanding the type is up to your program.
SAX sources can be augmented into SAX results, and DOM sources into DOM results; but SAX sources can't be augmented to DOM results or vice versa.
If you need to do that, first augment into the matching result -- SAX for SAX and DOM for DOM -- and then use Tr AX's identity transform to change the model. Putting all the information the document requires in the instance is far more reliable than splitting it between the instance and the schema. The W3C XML Schema Language is heavily based on the notion of .
This is useful for adding constraints that are more easily checked in a Turing-complete language like Java than in a declarative language like the W3C XML Schema language.
You can define a mini-schema language, write a quick implementation, and plug it into the validation layer.
Elements and attributes are declared to be of type int, double, date, duration, person, Phone Number, or anything else you can imagine.
The Java Validation API includes a means to report such types, although it's surprisingly independent of the rest of the package. This simple interface, summarized in Listing 5, tells you the local name and namespace URI of a type.
In the context of Extensible Markup Language (XML), validation normally involves writing a detailed specification for the document's contents in any of several schema languages such as the World Wide Web Consortium (W3C) XML Schema Language (XSD), RELAX NG, Document Type Definitions (DTDs), and Schematron.