However, it's usually done before any further processing of the input takes place.(This description is painted with broad strokes -- there are exceptions.)Until recently, the exact Application Programming Interface (API) by which programs requested validation varied with the schema language and parser.This package is also available in Java 1.3 and later when you install JAXP 1.3 separately.
It doesn't work at all for stream sources and results.
Typically, the URL is the namespace Uniform Resource Identifier (URI) for the schema language. However, you can install additional libraries that add support for these and other schema languages.
The Java programming language isn't limited to a single schema factory.
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.