Element Domain Specialization Step 3: Declare The Module Entities File
Step 3-2. Declare Type-Specific Integration Entities

Step 3-1. Create xmlDomain.ent

Create a new file named "xmlDomain.ent" and put a descriptive header comment at the top: 
<!-- ====================================================
     XML Construct Domain Module
    
     Author: your name here

     Copyright (c) 2011 copyright holder
     
     license to use or not use or whatever
          
     ==================================================== -->