[librecat-dev] fix with Catmandu identifier

[Jorg Delutan]

Dear all,

i try to use Catmandu-Identifier, with the use of
Catmandu::Fix::Condition::is_valid_isbn-condition.
and i do this, as Basil described, for example, i delete the $a with the
invalid ISBN, ISSN, and then create a new subfield, $z, with the invalid
ISBN, ISSN..

So i also would appreciate, after the issue is closed an example, of how i
could use it, in an elegant way, in order to move all invalid isbn numbers,
to $z, of tag 010, and all invalid ISSN numbers, in tag 011 $z respectively.

Best regards
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