[locale.facet]/1 (then-called [lib.locale.facet]) read in C++03:

Class facet is the base class for locale feature sets. A class is a facet if it is publicly derived from another facet, or if it is a class derived from locale::facet and containing a publicly-accessible declaration as follows: ²²¹⁾

static ::std::locale::id id;

Template parameters in this clause which are required to be facets are those named Facet in declarations. A program that passes a type that is not a facet, as an (explicit or deduced) template parameter to a locale function expecting a facet, is ill-formed.

²²¹⁾ This is a complete list of requirements; there are no other requirements. Thus, a facet class need not have a public copy constructor, assignment, default constructor, destructor, etc.

LWG 436's intent appears to be to ban volatile-qualified facets and permitting const-qualified ones. The PR was somewhat poorly worded, however, and the editor in applying it deleted the whole first half of the paragraph, including the definition of facet and the requirement for a static data member named id.

As a result, we have things like [locale.id]/2 and [locale.global.templates]/1 referring to the id member that's not defined anywhere in the working draft.

(If this isn't editorial, I'll be happy to submit an LWG issue instead.)