Suggest adding a brief statement to the beginning of this section to explain the reason behind standard opening phrases.
Something like...
In order to provide a more consistent voice across NIEM, a model built from requirements from many different sources, component data definitions should begin with a standard opening phrase, as defined below.
11.6.1.1. Data definition opening phrases
Suggest adding a brief statement to the beginning of this section to explain the reason behind standard opening phrases.
Something like...