<ncoi-1> contains all basic descriptive elements. There are also elements like <chapter> or <fail-save-concept> in the MSRSYS DTD which have the same content model as <ncoi-1>.
The figure below illustrates the structure of <ncoi-1>.
Figure 4: Structure of <ncoi-1>
There also are two weaker ncoi models ( ncoi-2 and ncoi-3) with lesser elements than <ncoi-1>. ncoi-2 has no <chapters>. ncoi-3 has also no chapters and futhermore another "topic" model without <prms>.
The components of ncoi  are interchangeable between all MSR DTDs  without any changes.
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