When is an attribute an attribute?

[Roy Tennant]

I've been trying to figure this out for a while with no success. It seems
to me that there are several quite different ways one can encode
information in XML. Are all of the following correct? When and why would
you choose one over another? Does it matter? Thank you for your indulgence
as I puzzle out what must surely be readily apparent to most of you.

Example 1:
---------

<BOOK TITLE="The Call of the Wild" AUTHOR="London, Jack"\>

Example 2:
---------

<BOOK AUTHOR="London, Jack">The Call of the Wild</BOOK>

Example 3:
---------

<BOOK>
   <TITLE>The Call of the Wild</TITLE>
   <AUTHOR>London, Jack</AUTHOR>
</BOOK>

Thanks,
Roy Tennant


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