After being done with the previous work, we are arrived at a point, where we can take some kind of a rest, reflecting about what information we had gained and how it is structured. What we did was to extract sections of the files and to translate them into a different syntactical presentation. However, what we did not do up to here is to make any considerations about what is meant by all the tables, and grammars and how they are mutually related. This will be done in this chapter, we try to clarify all these properties of the data model and concepts of transactions.
First we take a look at the the relationship of HL7 conceptual entities that explicitly appear in the specification. We will optimize it by removing redundancies, and -- perhaps most important -- we gain an oversight of what HL7 defines. Then we check the database that we compiled in the last step for errors and inconsistencies, and we prove an important assumption we made in the preceding section. Finally we focus on the contents of the relations, we ask what in particular is defined, and how is it defined.