android-platform-libcore/luni/src/main/java/javax/xml/validation/package.html - nest-cam/4320010/android-platform-libcore - Git at Google

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
 <!-- $Id: package.html 570104 2007-08-27 13:28:24Z mrglavas $ -->
 <html>
 	<body bgcolor="white">
 		<p>
 		    This package 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>
         <p>
             There are a number of popular technologies available for creating an XML schema. Some of the most
             popular 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>
         <p>
 		    Previous versions of JAXP supported validation as a feature of an XML parser, represented by
 		    either a {@link javax.xml.parsers.SAXParser} or {@link javax.xml.parsers.DocumentBuilder} instance.
         </p>
         <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 languages.</strong> As of JDK 1.5, the two most
 		        popular JAXP parser implementations, Crimson and Xerces, only support 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>
 		<p>
             <a name="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
     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!
     }
 </pre>
 		</p>
 		<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>
         </p>
         <p>

 	</body>
 </html>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
	<!-- $Id: package.html 570104 2007-08-27 13:28:24Z mrglavas $ -->
	<html>
	<body bgcolor="white">
	<p>
	This package 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>
	<p>
	There are a number of popular technologies available for creating an XML schema. Some of the most
	popular 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>
	<p>
	Previous versions of JAXP supported validation as a feature of an XML parser, represented by
	either a {@link javax.xml.parsers.SAXParser} or {@link javax.xml.parsers.DocumentBuilder} instance.
	</p>
	<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 languages.</strong> As of JDK 1.5, the two most
	popular JAXP parser implementations, Crimson and Xerces, only support 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>
	<p>
	<a name="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
	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!
	}
	</pre>
	</p>
	<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>
	</p>
	<p>

	</body>
	</html>