Actually, i was surprised that this persistence.xml did not fail schema 
validation, because the "value" is a "required" attribute as per the xsd 
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd.

Looks like the xml validation is not triggered unless you add the following to 
your persistence.xml:

<persistence
  |     xmlns="http://java.sun.com/xml/ns/persistence";
  |     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  |     xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";
  |     version="1.0"> 

So your persistence.xml should ultimately look like:


  | <?xml version="1.0" encoding="UTF-8"?>
  | 
  | <persistence
  |     xmlns="http://java.sun.com/xml/ns/persistence";
  |     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  |     xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";
  |     version="1.0"> 
  |   
  |   <persistence-unit name="mydb">
  |     
  |   <jta-data-source>java:/XAOracleDS</jta-data-source>
  |    
  |   <properties>
  |  
  |    
  |      <property  name="dialect" 
value="org.hibernate.dialect.Oracle9Dialect"/> 
  |      
  |   </properties>
  | 





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