06-05-2013, 03:00 PM
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#32
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Guru
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This passage from the OPF-2.0.1 spec seems relevant:
Quote:
2.1: Package Identity
The package element is the root element in an OPF Package Document; all other elements are nested within it.
The package element must specify a value for its unique-identifier attribute. The unique-identifier attribute's value specifies which Dublin Core identifier element, described in Section 2.2.10, provides the package's preferred, or primary, identifier. The OPF Package Document's author is responsible for choosing a primary identifier that is unique to one and only one particular package (i.e., the set of files referenced from the package document's manifest).
Notwithstanding the requirement for uniqueness, Reading Systems must not fail catastrophically if they encounter two distinct packages with the same purportedly unique primary identifier.
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(emphasis mine).
Albert
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