When MSR started to use SGML/XML for documenting the MSR activities itself, it became clear that a DTD for arbitrary documents is required. So MSRREP.DTD was developed and can be used to write reports and specifications not yet covered by the other DTDs (e.g. test reports etc.)
MSRREP.DTD provides:
 
Generic document structure (chapters, paragraphs etc.)
 
Detailed model for change management
In the meanwhile this DTD is used for many use cases with additional processing functionality, which can be attached on every element with special attributes.