[uf-new] item property (was: hAudio: audio-title/album-title vs. recording/album)

[Manu Sporny]

Martin McEvoy wrote:
> Justin
>> I don’t think you can make album-title mandatory. Unless you can tell  
>> me what album Martin Luther King’s ‘I have a dream’ speech is on ;)

It's not on an album, and would be marked up like so, per the current
approach:

<div class="haudio">	
   <span class="fn">I Have a Dream</span>, a
   <span class="category">speech</span> by
   <span class="contributor">Martin Luther King, Jr.</span>
</div>	

album-title is NOT mandatory. It is only mandatory when you're listing
one or more TRACKs.

-- manu