Programming WebLogic XML
The topics in this document are relevant during the design and development phases of a software project. The document also includes topics that are useful in solving application problems that are discovered during test and pre-production phases of a project.
Although this document does include administration and monitoring information useful to developers who want to test their applications in a development environment, the document does not address production-phase administration, monitoring, or performance tuning topics XML topics. For links to WebLogic Server® documentation and resources for these topics, see Related Documentation.
It is assumed that the reader is familiar with Web technologies, XML, XSLT, the Java programming language, and the Servlet and JSP APIs of the J2EE specification. This document emphasizes the value-added features provided by WebLogic Server XML and key information about how to use WebLogic Server features and facilities to get an application that performs XML processing up and running.
Using the WebLogic XML Streaming API (Deprecated), describes how to use the deprecated WebLogic XML Streaming API. The topic is included in this guide for legacy reasons only; you should not use this API for new applications. Instead you should use StAX, described in Using the Streaming API for XML (StAX).
In addition to this document, BEA Systems provides a variety of code samples for XML developers. The examples and tutorials illustrate WebLogic Server XML in action, and provide practical instructions on how to perform key XML development tasks.
WebLogic Server optionally installs API code examples in
WL_HOME is the top-level directory of your WebLogic Server installation. You can start the examples server, and obtain information about the samples and how to run them from the WebLogic Server Start menu.
Additional API examples for download at http://dev2dev.bea.com. These examples are distributed as .zip files that you can unzip into an existing WebLogic Server samples directory structure.
WebLogic Server consolidates XML technologies applicable to WebLogic Server and XML applications based on WebLogic Server. The WebLogic Server XML subsystem allows customers to use standard parsers, the WebLogic FastParser, XSLT transformers, and DTDs and XML Schemas to process and convert XML files.
You can also use any other XML parser of your choice by using the Administration Console to configure it in the XML Registry. You can configure a single instance of WebLogic Server to use one parser for a particular application and use another parser for a different application.
For information about parsing XML documents, see Parsing XML Documents.
The default parser in Versions 8.1and previous of WebLogic Server was one that was
based on Apache's Xerces parser and whose package name started with
weblogic.apache.xerces.*. In Version 9.1 of WebLogic Server, this parser has been deprecated. Instead, the default parser is the same one that is shipped in JDK 5.0.
For backward compatibility, the
weblogic.apache.xerces.* parser is still available in Version 9.1 of WebLogic Server, although it is deprecated and BEA highly recommends you do not use it since it will not be available in future versions. If, however, you need to temporarily continue using this parser, you must use the Administration Console to configure a parser other than the default for your WebLogic Server instance by updating, or creating a new, XML Registry and setting the default implementation classes for SAX and DOM parser factory interfaces as indicated in the following table:
For information about creating an XML Registry, see Administering WebLogic Server XML.
You can also use any other XML transformer of your choice by using the Administration Console to configure it in the XML Registry. You can configure a single instance of WebLogic Server to use one transformer for a particular application and use another transformer for a different application.
For more information about transforming XML documents, see Transforming XML Documents.
For more information, see Using the Streaming API for XML (StAX).
For more information, see Using the WebLogic XPath API.
Java API for XML Processing (JAXP) 1.2 is a Java-standard, parser-independent API for XML. For more information on JAXP, see What Is JAXP?.
Note: WebLogic Server uses the XML Registry, accessed through the Administration Console, to plug in parsers and transformers. This is different from the JAXP 1.2 specification which specifies the use of system properties to plug in parsers and transformers.
The Java API for XML Registries (JAXR) API provides a uniform and standard Java API for accessing different kinds of registries, in particular XML registries used in Web Service applications.
For more information, see Using the Java API for XML Registries (JAXR) API.
For more information, see Parsing XML Documents in a Servlet.
The JSP tag library provides a simple tag that enables access to the default XSLT transformer from within a Java Server Page (JSP) running on WebLogic Server. Currently, this tag supports the default XSLT transformer only; you cannot use the tag to transform an XML document from within a JSP using a different transformer.
For more information, see Using the JSP Tag to Transform XML Data.
The XML Registry simplifies administration and configuration tasks by separating these tasks from the XML application. Use the Administration Console to configure the parsers and transformers for an instance of WebLogic Server.
For more information, see XML Parser and Transformer Configuration Tasks.
WebLogic XML supports external entity resolution through the XML Registry. For more information, see External Entity Configuration Tasks.
An endorsed standard is a Java API defined through a standards process other than the Java Community Process (JCP). For more information, see Endorsed Standards Override Mechanism.
To learn more about XML, see the following online courses and tutorials. XML Reference, provides links to additional information.