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Old 07-05-2012, 11:55 AM   #1
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What are: url:http|// ... urn:urn|uuid| ... uri:http|//

Principally, what is the difference between url:http|// and uri:http|// ?

But in asking this, I've now come across urn:urn|uuid| as well.

Can someone explain please.

I thought it would be handy to put the URL of the forum thread whence I grab a book release on here into the Ids box in the books' metadata. Should I use url or uri? And what is urn?

Last edited by 44reader; 07-05-2012 at 11:56 AM. Reason: typo
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Old 07-05-2012, 11:58 AM   #2
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See:

http://en.wikipedia.org/wiki/Uniform...rce_identifier
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Old 07-05-2012, 12:24 PM   #3
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Crikey!

OK, thanks, Harry.

So a URI is a broader term of which URN (name) and URL (address) are sub-terms.

I think I'll stick with url:http|// when I put MobileRead threads' URLs into my books' metadata. I'm not sure why Gutenberg uses "uri" - even reading that article.

Anyway, thanks; unless I've missed something, I can use uri or url interchangeably. They will both provide a click-able link in the Book Details pane in calibre, right?
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Old 07-05-2012, 12:27 PM   #4
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Quote:
Originally Posted by 44reader View Post
Anyway, thanks; unless I've missed something, I can use uri or url interchangeably. They will both provide a click-able link in the Book Details pane in calibre, right?
Yes, I believe that's correct. All URLs are also URIs (but not vice versa).
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Old 07-05-2012, 12:28 PM   #5
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Thanks for the quick reply, Harry.

Last edited by 44reader; 07-05-2012 at 01:19 PM. Reason: deleted lazy request
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Old 07-05-2012, 01:42 PM   #6
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Also, like ISBNs, you cannot have a two URIs in the same Ids field.

You can have a URL and a URI, but then only the URI (calibre sorts the Ids alphabetically, it seems) shows as a click-able link in Book Details.

Eg.
Code:
uri:http|//www.gutenberg.org/ebooks/8914, url:http|//www.mobileread.com/forums/showthread.php?t=183220
is OK but only the Gutenberg link is click-able.

When you change the URL to a URI like this:
Code:
uri:http|//www.gutenberg.org/ebooks/8914, uri:http|//www.mobileread.com/forums/showthread.php?t=183220
the MobileRead link overwrites the Gutenberg one.

You end up with only this:
Code:
uri:http|//www.mobileread.com/forums/showthread.php?t=183220
That's a shame.

It also means I can't have a click-able link to the MobileRead thread as well as Zelda Pinwheel's Id that she put in her Three Men In A Boat upload.

This doesn't provide a click-able link:
Code:
uri:zelda@mobileread.com|2010040720, url:http|//www.mobileread.com/forums/showthread.php?t=48377
Pity.
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