On 8/5/14, 3:13 AM, Juha Hakala wrote:
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libraries took their part in blurring that semantics,
but that is a different story.
Can you elaborate a bit what you mean by this?
Thomas may be referring to the usage in the MARC format:
$a - International Standard Book Number
Valid ISBN. ISBN and the embedded hyphens may be
generated for display.
As you can see, the hyphens are removed, and the ISBN is a single
string of 0-9,X. "Valid ISBN" there does not refer to the form (e.g.
removed hyphens) but to the fact that there is another subfield for
ISBNs that have either been assigned to the MARC or that appear on
the actual book that have later turned out to be invalid in some way
(re-used, typo'd, etc.)
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