SBVR_ — Rule-Set is not a defined concept

Clause 7.1.2 is titled:
Other Namespaces and Rule Sets Presented in this Document
and it defines the symbol Vocabulary-to-MOF/XMI Mapping Rule Set
as: "General Concept: set"

Clause 13 specifies the mapping of vocabularies and rule sets from the SBVR Structured English form to a MOF/XMI exchange form. And clause 13 defines several information resources that are said to be "rule sets".

Clause C.4 is titled: Specifying a Rule Set

But the concept 'rule set' is not defined anywhere in the specification!

This term should not be used in so fundamental a way without being formally defined.

Further, 7.1.2 should specify that the individual concept 'Vocabulary-to-MOF/XMI Mapping Rule Set' is an instance of 'rule set', i.e.,
"General Concept: rule set"

The use of “rule set” in the introduction to clause 7 is left over from an old version and should be removed, because clause 7 does not contain any rule sets.
The term “rule set” is used by the SBVR Structured English and is not intended to be normative. Its use in the Annex on SBVR Structured English must be clarified.