This class was defined and incorporated into CDNO release 3.0. The development of this class has included discussion on GitHub.
The definition of dietary material physical attribute is A functional attribute that inheres in one or more dietary chemical component (or food material) and may contribute to a dietary role.
This is one of the proposed classes where 'physical attribute' is initially suggested sensu http://purl.obolibrary.org/obo/NCIT_C158424 (Any of the characteristics that define the nature of matter or forces that act upon it) and is distinct from the proposed 'functional attribute' class. One may expect terms such as 'energy', 'specific gravity' to be included in this class.