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Posted by / 15-May-2020 13:04

Validating xml schema java

(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.

DTDs and XSD were normally accessed as configuration options in Simple API for XML (SAX), Document Object Model (DOM), and Java™ API for XML Processing (JAXP). Schematron might use the Transformations API for XML(Tr AX); and still other schema languages required programmers to learn still more APIs, even though they were performing essentially the same operation.

The reason is that XML software should be small, fast, and compatible.

HTML browsers are allowed to display HTML documents with errors (like missing end tags). A "well formed" XML document is not the same as a "valid" XML document. In addition, it must conform to a document type definition.

A well-formed XML document is an XML document with correct syntax.

It is very necessary to know about valid XML document before knowing XML validation.

When you pass a URI identifying a particular schema language to that know how to process your schema language.

Java 5 introduced the package to provide a schema-language-independent interface to validation services.

This package is also available in Java 1.3 and later when you install JAXP 1.3 separately.

Sometimes validation is performed while parsing, sometimes immediately after.

However, it's usually done before any further processing of the input takes place.

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