The "IReferenceable" behavior is used for enabling UUID (plone.app.uuid) support for dexterity contents, like in archetypes content types. This allow for example references between archetypes and dexterity content types.

Note: It can't work with Plone==4.0 because it is based on plone.uuid integration in CMF. It is compatible with Plone>=4.1

Just use the behavior "plone.app.referenceablebehavior.referenceable.IReferenceable" in your dexterity content type.

In your profiles/default/types/YOURTYPE.xml add the behavior:

<?xml version="1.0"?>
<object name="example.conference.presenter" meta_type="Dexterity FTI"
   i18n:domain="example.conference" xmlns:i18n="http://xml.zope.org/namespaces/i18n">

 <!-- enabled behaviors -->
 <property name="behaviors">
     <element value="plone.app.referenceablebehavior.referenceable.IReferenceable" />
 </property>

</object>