/* * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /** *
* 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 ones include: * *
* While JAXP supports validation as a feature of an XML parser, represented by * either a {@link javax.xml.parsers.SAXParser} or {@link javax.xml.parsers.DocumentBuilder} * instance, the {@code Validation} API is preferred. * *
* 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 * DocumentBuilder parser = DocumentBuilderFactory.newInstance().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 {@link javax.xml.validation.Schema} with the validation API
* and associate it with a {@link javax.xml.parsers.DocumentBuilderFactory} or
* a {@link javax.xml.parsers.SAXParserFactory} instance by using the
* {@link javax.xml.parsers.DocumentBuilderFactory#setSchema(Schema)} and
* {@link javax.xml.parsers.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.
*
*
* @since 1.5
*/
package javax.xml.validation;