Possibility to improve hbm.xml Mapping file configuration

Problem solved by mapping-by-code.

But the !DOCTYPE should be locked by XSD validation

Take a look at what XML entities are, they are a way to import some XML from another file.
It looks somewhat like this:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" [
<!ENTITY usageTracking SYSTEM "file:./UsageTrackingComponent.xml">
]>

<hibernate-mapping>
<!-- CVS: $Id: DynamicEnum.hbm.xml,v 1.3 2004/01/19 03:57:29 eepstein Exp $ -->

<class
name="com.publishworks.common.DynamicEnum"
table="dynamic_enum"
schema="common"
>

&usageTracking;

</class>
</hibernate-mapping>

From where can I get MyComponent.

This is actually already there, in the sense of XML entities

&MyComponent;