Kelley McGrath <[log in to unmask]> wrote:
Like many things, this is not so simple in practice. The meaning of 245$b depends on the preceding subfield (often, but not always $a). Preceded by : it's a subtitle. Preceded by = it's a parallel title. Preceded by ; it's a second title (another work) by the same person or people as the title in $a. In addition, you can have ISBD punctuation within the subfield for parallel titles or more titles by the same person/people.

Then you've got all of those MARC records that don't use ISBD punctuation at all.

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