Meta-Data - JDO

JDO defines XML MetaData in jdo files as well as orm files. As always with XML, the metadata must match the defined DTD/XSD for that file type. This section describes the content of the jdo files. The content of orm files can be found here. All jdo files must contain a valid DTD/DOCTYPE specification. You can use PUBLIC or SYSTEM versions of these.

Here are a few examples valid for jdo files with DTD specifications 

<!DOCTYPE jdo PUBLIC
    "-//Sun Microsystems, Inc.//DTD Java Data Objects Metadata 3.0//EN"
    "http://xmlns.jcp.org/dtd/jdo_3_0.dtd">

<!DOCTYPE jdo SYSTEM "file:/javax/jdo/jdo.dtd">

Here is an example valid for jdo files with XSD specification 

<?xml version="1.0" encoding="UTF-8" ?>
<jdo xmlns="http://xmlns.jcp.org/xml/ns/jdo/jdo"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/jdo/jdo
        http://xmlns.jcp.org/xml/ns/jdo/jdo_3_0.xsd">
    ...
</jdo>

Your MetaData should match either the DTD or the XSD specification.