Package javax.xml.validation

This package provides an API for validation of XML documents.

See:
          Description

Class Summary
Schema Immutable in-memory representation of grammar.
SchemaFactory Factory that creates Schema objects. Entry-point to the validation API.
SchemaFactoryLoader This class was removed from JAXP 1.3 before it was finalized but was mistakenly included in Java 5.
TypeInfoProvider This class provides access to the type information determined by ValidatorHandler.
Validator A processor that checks an XML document against Schema.
ValidatorHandler Streaming validator that works on SAX stream.
 

Package javax.xml.validation Description

This package provides an API for validation of XML documents. Validation is the process of verifying that an XML document is an instance of a specified XML schema. An XML schema defines the content model (also called a grammar or vocabulary) that its instance documents will represent.

There are a number of popular technologies available for creating an XML schema. Some of the most popular include:

Previous versions of JAXP supported validation as a feature of an XML parser, represented by either a SAXParser or DocumentBuilder instance.

The JAXP validation API decouples the validation of an instance document from the parsing of an XML document. This is advantageous for several reasons, some of which are:

Usage example. The following example demonstrates validating an XML document with the Validation API (for readability, some exception handling is not shown):

            
    // parse an XML document into a DOM tree
    DocumentBuilderFactory parserFactory = DocumentBuilderFactory.newInstance();
    parserFactory.setNamespaceAware(true);
    DocumentBuilder parser = parserFactory.newDocumentBuilder();
    Document document = parser.parse(new File("instance.xml"));

    // create a SchemaFactory capable of understanding WXS schemas
    SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

    // load a WXS schema, represented by a Schema instance
    Source schemaFile = new StreamSource(new File("mySchema.xsd"));
    Schema schema = factory.newSchema(schemaFile);

    // create a Validator instance, which can be used to validate an instance document
    Validator validator = schema.newValidator();

    // validate the DOM tree
    try {
        validator.validate(new DOMSource(document));
    } catch (SAXException e) {
        // instance document is invalid!
    }

The JAXP parsing API has been integrated with the Validation API. Applications may create a Schema with the validation API and associate it with a DocumentBuilderFactory or a SAXParserFactory instance by using the DocumentBuilderFactory.setSchema(Schema) and SAXParserFactory.setSchema(Schema) methods. You should not both set a schema and call setValidating(true) on a parser factory. The former technique will cause parsers to use the new validation API; the latter will cause parsers to use their own internal validation facilities. Turning on both of these options simultaneously will cause either redundant behavior or error conditions.



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