I believe you should transcribe what you see for RDA, unless you don't 
have the particular characters available to you on your keyboard or in 
OCLC.  RDA 1.7.3 says to transcribe punctuation as it appears on the 
source.  Wikipedia says "Brackets are tall punctuation marks used in 
matched pairs within text, to set apart or interject other text."

Adam

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Adam L. Schiff
Principal Cataloger
University of Washington Libraries
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Seattle, WA 98195-2900
(206) 543-8409
(206) 685-8782 fax
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On Wed, 31 Oct 2012, Jennifer B Young wrote:

> Greetings Colleagues,
>
> A fellow NU cataloger has come across the following situation and we are stymied by how to proceed.
>
> On the piece, the title is: [Prisciani] De accentibus
>
> So we have 245 10 ?a [Prisciani] De accentibus
>
> While our bib record is being cataloged using AACR2, we are contributing a RDA authority record.
> 100 0_ ?a Priscian, ?d fl. ca. 500-530. ?t De accentibus. ?l Italian
> 400 0_ ?a Priscian, ?d fl. ca. 500-530. ?t [Prisciani] De accentibus
>
> We have not been able to find any guidance in either AACR2 or RDA on how to transcribe the square brackets. In our minds, square brackets usually denote supplied information of some sort. We don't want others to think that we supplied something we did not.
>
> Thoughts and suggestions welcome!
> Jennifer
>
> Jennifer B. Young
> Serials Catalog Librarian
> Northwestern University Library
> 847.491.8978
> [log in to unmask]
>