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 orm files. The content of jdo files can be found here. All orm files must contain a valid DTD/DOCTYPE specification. You can use PUBLIC or SYSTEM versions of these.
Here are a couple of examples valid for orm files with DTD specification
<!DOCTYPE orm PUBLIC
"-//The Apache Software Foundation//DTD Java Data Objects Mapping Metadata 3.2//EN"
"https://db.apache.org/jdo/xmlns/orm\_3\_2.dtd">
or
<!DOCTYPE orm SYSTEM "file:/javax/jdo/orm.dtd">
Here is an example valid for orm files with XSD specification
<?xml version="1.0" encoding="UTF-8" ?>
<orm xmlns="https://db.apache.org/jdo/xmlns/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://db.apache.org/jdo/xmlns/orm https://db.apache.org/jdo/xmlns/orm\_3\_2.xsd" version="3.2">
...
</orm>
Your MetaData should match either the DTD or the XSD specification.
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