Disallow empty content for the four required "dc:" metadata items in OPF

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For full description see:

http://www.daisy.org/epub/issues/use-relax-ng-text-pattern-schema-title-identifi
er-and-others

When we're drafting OPF language this time around, it seems likely we should 
disallow empty content in the four required "dc:" metadata elements (e.g. 
dc:title, dc:identifier); we already have required content verbiage for 
dc:language.

Original issue reported on code.google.com by garthcon...@gmail.com on 19 Aug 2010 at 12:44

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In practice it will mean people will stick garbage there (e.g. "Unknown 
Title"). And people already faking it for dc:language marking all document as 
English. The problem is that when you write a converter of some source format 
to EPUB and your source document does not have data for those you do not have 
good options. I think not requiring them would match reality better. 

This does not apply to dc:identifier, it is easy to generate UUID or some other 
identifier, even there is nothing better available.

Original comment by soroto...@gmail.com on 6 Oct 2010 at 5:47

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Because these elements are required it seems appropriate to disallow empty 
content. ImplementationProposalMetadata wiki page has been updated accordingly.

Original comment by bkasd...@apexcovantage.com on 5 Nov 2010 at 8:57

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Original comment by bkasd...@apexcovantage.com on 5 Nov 2010 at 9:05

• Changed state: Answered