Indicates for the associated <isbn> and <issn> elements whether the number provided is the primary number when multiple numbers are given. This attribute will be typically
be used to indicate that the number is not the primary one, that is, the attribute’s value will be “no”.
Value |
Meaning |
no |
The number is not the primary number. |
yes |
The number is the primary number. |
Restriction: This attribute may be specified if the element is used.
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