Meta-Data - ORM

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

    "-//Sun Microsystems, Inc.//DTD Java Data Objects Mapping Metadata 3.0//EN"

<!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=""

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