Yes, the comments still apply.
There are basically two classes of XML schemas used with NORMA. One class has both an in-memory and an XML representation, and you'll see the namespaces for these listed on the root element of the .orm file. The second class of namespaces are used as intermediate formats for code generation only. The original (very outdated) absorption model (schema name http://schemas.orm.net/OIAL) is a class2 format, whereas the newer one also has an in-memory representation (schema name http://schemas.neumont.edu/ORM/Abstraction/2007-06/Core).
The conceptual database schema (schema name http://schemas.neumont.edu/ORM/Relational/2007-06/ConceptualDatabase) is a class1 format representing a relational model. However, not all of the parts we currently generate are there (check clauses, data types, etc). DCIL (schema name http://schemas.orm.net/DIL/DCIL) is a class2 format that most downstream generators are based on. In general, DCIL represents relational elements (tables, columns, reference constraints, etc) while DIL is an intermediate format representing DDL (create table statements instead of table elements). DIL is then formatted into the different SQL flavors, which are all overrides of the SQL standard. Obviously, any changes need to be made in the appropriate formatter.
The generation settings dialog will generally show you class 2 dependencies by graying out dependencies. The only behavioral difference in the 'secondary' branch is that the file automatically turns off in the diallog when it is no longer in use. You can see format dependencies in the HKLM\SOFTWARE\ORM Solutions\Natural ORM Architect for Visual Studio 2005\Generators key (adjust for VS2008).