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Enterprise JavaBeans, Fourth Edition
book

Enterprise JavaBeans, Fourth Edition

by Sacha Labourey, Bill Burke, Richard Monson-Haefel
June 2004
Intermediate to advanced content levelIntermediate to advanced
792 pages
23h 17m
English
O'Reilly Media, Inc.
Content preview from Enterprise JavaBeans, Fourth Edition

The Document Headerand Schema Declarations

An XML document may start with a tag that specifies the version of XML in use:

<?xml version="1.0" encoding="UTF-8"?>

This tag identifies the document as an XML document that adheres to Version 1.0 of the XML specification and uses the UTF-8 character encoding. EJB vendors usually support this character encoding.

In EJB 2.1, the element following the XML header (the <ejb-jar> element) is the root element of the deployment descriptor. This element declares the document’s XML namespace and the location of the XML schema that can be used to validate its contents. A complete <ejb-jar> element looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
               http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd"
      version="2.1">
...
</ejb-jar>

In EJB 2.0, a DOCTYPE element follows the document header and specifies the DTD that defines the document’s contents:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise
               JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
...
</ejb-jar>

In both EJB 2.1 and 2.0, the schema definition provides a URL from which you (or, more importantly, tools processing the deployment descriptor) can download the schema used to validate the XML document; this means that the EJB server deploying the bean can download the ...

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Publisher Resources

ISBN: 059600530XSupplemental ContentCatalog PageErrata