EJB3的XML Schema第一讲

在XML Schema 中的注释规定了XML Schema 机制不方便表达的语法和语义的要求。
XML 元素的内容通常都是大小写敏感的（也就是说，除非另有说明）。意思是，例如，必须使用<transaction-type>Container</transaction-type>而不是<transaction-type>container</transaction-type>
所有有效的ejb-jar 部署描述必须遵循下面的XML Schema 定义，或本规范以前版本的DTD 定义。

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://java.sun.com/xml/ns/javaee"
xmlns:javaee="http://java.sun.com/xml/ns/javaee"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified"
version="3.0">
<xsd:annotation>
<xsd:documentation>
@(#)ejb-jar_3_0.xsds1.51 02/23/06
</xsd:documentation>
</xsd:annotation>
<xsd:annotation>
<xsd:documentation>
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</xsd:documentation>
</xsd:annotation>
<xsd:annotation>
<xsd:documentation>
<![CDATA[
部署描述必须在EJB jar 文件中命名为"META-INF/ejb-jar.xml"。所有的EJB部署描述必须通过使用Java EE 命名空间http://java.sun.com/xml/ns/javaee 来声明ejb-jar schema，并且应当按如下所示声明schema 的版本：
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
version="3.0">
...
</ejb-jar>
实例文档可以使用xsi:schemaLocation 属性为具有如下位置的Java EE 命名空间声明schema 的印刷版本: http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd
</xsd:documentation>
</xsd:annotation>
<xsd:annotation>
<xsd:documentation>
下面的约定应用于所有的Java EE 部署描述元素，除非有其他说明。在元素中指定同一个JAR 文件中文件的路径名（也就是，那些不以“/”开头的路径名）认为是相对于JAR 文件命名空间。绝对文件名（也就是以“/”开头）指的是JAR 文件命名空间的根路径中的名字。通常，相对名字是最好的方式。例外情况是，为了与Servlet API 一致，在.war 文件中使用绝对名字是最好的。
</xsd:documentation>
</xsd:annotation>
<xsd:include schemaLocation="javaee_5.xsd"/>
<!-- **************************************************** -->
<xsd:element name="ejb-jar" type="javaee:ejb-jarType">
<xsd:annotation>
<xsd:documentation>
这是ejb-jar 部署描述的根.