This may not be a complete answer but, http://www.jpox.org/docs/1_2/tutorials/jpa_tutorial.html uses JPA 1.0. However, it was of use when I created my ORM.xml for JPA 2.0. I know "Enterprise JavaBeans 3.0" from O'Reilly has good examples too. Otherwise you have to look at the schema (would post the link but apparently I don't have enough rep to post multiple links) and match it up with annotations examples...at least that is what I had to do.
ORM.xml appears to be falling out of favor for the annotation version, which explains the difficulty of finding any good examples of ORM.xml file.
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架构在这里，
http://java.sun.com/xml/ns/ persistence/orm_2_0.xsd
这里有很多每种映射类型的示例，
http://en .wikibooks.org/wiki/Java_Persistence
这里有很多例子，
http://wiki.eclipse.org/EclipseLink/Examples/JPA
特别是，
http://wiki.eclipse.org/EclipseLink/Examples/JPA/EmployeeXML
The schema is here,
http://java.sun.com/xml/ns/persistence/orm_2_0.xsd
There are lots of samples of each mapping type here,
http://en.wikibooks.org/wiki/Java_Persistence
Lots of examples here,
http://wiki.eclipse.org/EclipseLink/Examples/JPA
In particular,
http://wiki.eclipse.org/EclipseLink/Examples/JPA/EmployeeXML
这可能不是一个完整的答案，但是 http://www.jpox.org/ docs/1_2/tutorials/jpa_tutorial.html 使用 JPA 1.0。然而，当我为 JPA 2.0 创建 ORM.xml 时，它很有用。我知道 O'Reilly 的“Enterprise JavaBeans 3.0”也有很好的例子。否则，您必须查看架构（将发布链接，但显然我没有足够的代表来发布多个链接）并将其与注释示例相匹配......至少这是我必须做的。
ORM.xml 似乎不再受注释版本的青睐，这解释了很难找到任何好的 ORM.xml 文件示例。
This may not be a complete answer but, http://www.jpox.org/docs/1_2/tutorials/jpa_tutorial.html uses JPA 1.0. However, it was of use when I created my ORM.xml for JPA 2.0. I know "Enterprise JavaBeans 3.0" from O'Reilly has good examples too. Otherwise you have to look at the schema (would post the link but apparently I don't have enough rep to post multiple links) and match it up with annotations examples...at least that is what I had to do.
ORM.xml appears to be falling out of favor for the annotation version, which explains the difficulty of finding any good examples of ORM.xml file.