Advanced Rulemaking Notice

From today's Federal Register:

On October 19, 2007, we published final rules in the Federal Register (72 FR 59397) revising the criteria in sections 5.00 and 105.00 of the Listing of Impairments in appendix 1 to subpart P of part 404 of our regulations (the listings), the sections that we use to evaluate claims involving digestive disorders. In those rules, we indicated that we would issue an Advance Notice of Proposed Rulemaking (ANPRM) inviting public comments on whether we should add a functional listing for digestive disorders, and if so, what functional criteria would be appropriate (72 FR at 59416). We are now requesting your comments and suggestions.

After we have considered your comments and suggestions, other information about the functional effects of digestive disorders, and our adjudicative experience, we will determine whether it is appropriate to add a functional listing for digestive disorders. If we decide to add such a listing, we will publish for public comment a
Notice of Proposed Rulemaking (NPRM) that will propose specific revisions to the rules.

Just what do they mean by "functional limitations?"