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+++ b/jaxp/src/java.xml/share/classes/javax/xml/validation/package-info.java Wed May 24 14:10:04 2017 -0700
@@ -0,0 +1,133 @@
+/*
+ * 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.
+ */
+
+/**
+ * <p>
+ * Provides an API for validation of XML documents. <em>Validation</em> is the
+ * process of verifying that an XML document is an instance of a specified XML
+ * <em>schema</em>. An XML schema defines the content model (also called a
+ * <em>grammar</em> or <em>vocabulary</em>) that its instance documents will
+ * represent.
+ *
+ * <p>
+ * There are a number of popular technologies available for creating an XML schema.
+ * Some of the most popular ones include:
+ *
+ * <ul>
+ * <li><strong>Document Type Definition (DTD)</strong>
+ * - XML's built-in schema language.
+ * </li>
+ * <li><strong><a href="http://www.w3.org/XML/Schema">W3C XML Schema (WXS)</a></strong> -
+ * an object-oriented XML schema language. WXS also provides a type system
+ * for constraining the character data of an XML document. WXS is maintained
+ * by the <a href="http://www.w3.org">World Wide Web Consortium (W3C)</a>
+ * and is a W3C Recommendation (that is, a ratified W3C standard specification).
+ * </li>
+ * <li><strong><a href="http://www.relaxng.org">RELAX NG (RNG)</a></strong> -
+ * a pattern-based, user-friendly XML schema language. RNG schemas may
+ * also use types to constrain XML character data. RNG is maintained by
+ * the <a href="http://www.oasis-open.org">Organization for the Advancement
+ * of Structured Information Standards (OASIS)</a> and is both an OASIS
+ * and an <a href="http://www.iso.org">ISO (International Organization
+ * for Standardization)</a> standard.
+ * </li>
+ * <li><strong><a href="http://www.schematron.com/">Schematron</a></strong> -
+ * a rules-based XML schema language. Whereas DTD, WXS, and RNG are designed
+ * to express the structure of a content model, Schematron is designed to
+ * enforce individual rules that are difficult or impossible to express
+ * with other schema languages. Schematron is intended to supplement a
+ * schema written in structural schema language such as the aforementioned.
+ * Schematron is in the process of becoming an ISO standard.
+ * </li>
+ * </ul>
+ * <p>
+ * 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.
+ *
+ * <p>
+ * 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:
+ *
+ * <ul>
+ * <li><strong>Support for additional schema langauges.</strong>
+ * The JAXP parser implementations support only a subset of the available
+ * XML schema languages. The Validation API provides a standard mechanism
+ * through which applications may take of advantage of specialization
+ * validation libraries which support additional schema languages.
+ * </li>
+ * <li><strong>Easy runtime coupling of an XML instance and schema.</strong>
+ * Specifying the location of a schema to use for validation with JAXP
+ * parsers can be confusing. The Validation API makes this process simple
+ * (see <a href="#example-1">example</a> below).
+ * </li>
+ * </ul>
+ * <p>
+ * <a id="example-1"><strong>Usage example</strong>.</a> The following example
+ * demonstrates validating an XML document with the Validation API
+ * (for readability, some exception handling is not shown):
+ *
+ * <pre>
+ *
+ * // 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!
+ * }
+ * </pre>
+ * <p>
+ * 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.
+ * <strong>You should not</strong> both set a schema and call <code>setValidating(true)</code>
+ * 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. <strong>Turning on both of these options simultaneously will cause
+ * either redundant behavior or error conditions.</strong>
+ *
+ *
+ * @since 1.5
+ */
+
+package javax.xml.validation;