J. McRee Elrod <[log in to unmask]> wrote:

> A Soloka (are you the Alan Soroka formerly of UBC?) quoted:
> >"Qualifier of title information to make it unique."
> By "it" do they mean the title itself?

That definition is a slight paraphrase of the definition for the 222 $b,
and by extension the 210 $b as well.  According to the script for
"module.MBIB-2-BIBFRAME-Shared.xqy" on LC's BIBFRAME GitHub site (not sure
how to get a shorter URL for that particular page) this BF property gets
its due when converting records with the aforementioned subfields through
the MARC-to-BF filter.

This 222:

 222 -0 $a Notes d'information et statistiques $b (Banque centrale des
Etats de l'Afrique de l'Ouest)

gets converted into this (today, at any rate):

 <> a bf:Title ;
    bf:titleQualifier "(Banque centrale des Etats de l'Afrique de l'Ouest)"
    bf:titleValue "Notes d'information et statistiques" .

These are the nuts-and-bolts of the key title, linked from the Instance's
bf:keyTitle property via that "title41" URL:

<> a
        bf:Serial ;
    bf:keyTitle <>

Mark K. Ehlert                 Minitex
Coordinator                    University of Minnesota
Digitization, Cataloging &     15 Andersen Library
  Metadata Education (DCME)    222 21st Avenue South
Phone: 612-624-0805            Minneapolis, MN 55455-0439