more on xnotes

A bit more on xnotes and mods-bn:

First, note that I've constructed mods-bn in such as  way that the root 
element can be one of the following:

modsCollection
mods
xnoteset
xnote

Second, I've moved the user attribute to the note element.  Maybe we 
should allow it optionally on either note or xnote?

Third, I propose that the MARC/MODS method of dealing with keywords be 
adopted, or at least strongly considered.  In RIS, etc., you have:

<keyword>politics</keyword>
<keyword>history</keyword>
<keyword>United States</keyword>
<keyword>Canada</keyword>

In MODS/MARC, it could be:

<subject>
	<topic>politics</topic>
	<topic>history</topic>
	<geographic>United States</geographic>
	<geographic>Canada</geographic>
</subject>

...or:

<subject>
	<topic>politics</topic>
	<geographic>United States</geographic>
</subject>
<subject>
	<topic>history</topic>
	<geographic>Canada</geographic>
</subject>

Bruce



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