Requirements

Hibernate mapping files used with MD4J must satisfy a set of requirements:

• Each file must describe only one (sub) class.
• All files must belong to the same Java package.
• All files must be in the same directory on the filesystem.

Metadata

MD4J looks out for metadata in your input files (see metadata reference) and uses that to customize it's output based on your directions. Using MD4J metadata in Hibernate mappings is rather straightforward, for example you can use the md4j:render-as-image flag to render a property as an img tag in JSP (or whatnot) views:

        <property name="logo" type="string"  not-null="false">
            <meta attribute="md4j:render-as-image">true</meta>
        </property>