I have already programmed the RDA conversion program to re-punctuate century dates containing slashes (adding "century" where missing) and to supply "active" where missing. (Changing "3rd/4th cent." to "3rd century-4th century" without the "active" doesn't do the job well enough.)  As anyone might expect, there were a handful of dates with slashes but not including century designations, which were corrected if the change was obvious, or referred upstairs for investigation.

I have likewise programmed the just-approved insertion of the missing era abbreviation in dates such as "43 B.C.-16 or 17 A.D."

Gary L. Strawn, Authorities Librarian, etc.
Northwestern University Library, 1970 Campus Drive, Evanston IL 60208-2300
e-mail: [log in to unmask]   voice: 847/491-2788   fax: 847/491-8306
Forsan et haec olim meminisse iuvabit.         BatchCat version: 2007.22.416


-----Original Message-----
From: Program for Cooperative Cataloging [mailto:[log in to unmask]] On Behalf Of Moore, Richard
Sent: Thursday, November 15, 2012 3:05 AM
To: [log in to unmask]
Subject: Re: [PCCLIST] RDA for this author?

Add a new paragraph at the end of 9.3.1.3:
Record a period of activity expressed as a range of centuries in the
form
[century]-[century].
EXAMPLE
13th century-14th century