SMIL question

Can someone help explain some existing wording about SMIL in SpecGL?

GL.3, Profiles, [1], there is this paragraph:

"The SMIL Recommendations (e.g., [SMIL20]) illustrate several of these 
concepts. Modularization is an approach in which markup functionality is 
specified as a set of modules that contain semantically-related XML 
elements, attributes and attribute values. Profiling is a method for 
defining subsets of a specification by identifying the functionality, 
parameters, options, and/or implementation requirements necessary to 
satisfy the requirements of a particular community of users. In SMIL, it is 
the creation of an XML-based language through combining these modules, in 
order to provide the functionality required by a particular application. 
SMIL 2.0 defines all three of the concepts of modules, levels and profiles 
-- three modules (timing, ...), levels (regular, extended animation), and 
profiles are defined at the end of the specification."

All is fine -- good and accurate -- until the last sentence.  About "levels 
(regular, extended animation)" -- I can't find anything to support this in 
SMIL20.

As you might guess from the "2.0", there was a 1.0.  Some stuff has been 
added and some stuff has been deprecated.  But unlike DOM and CSS, SMIL 
does not refer to itself as "SMIL level 1" or "SMIL level 2".  So 1/2 
indicates some (historical) leveling, but it is weak.

???

-Lofton.

[1] http://www.w3.org/QA/WG/2002/07/qaframe-spec-0729#b2ab3d189