I am new to xml base databases and I've been reading through baseX, eXist and 
Sedona documentation trying to figure out which addresses my application needs 
and have not been able to figure it out. Any advise is appreciated.

I have a set of documents like:
   <booklist>
     <listDate>  date  </listDate>
      <Book>
         <title>title 1 </Title>
         <LastPublishDate> date </>
         <copiesSoldLastMonth> 213 </>
     </Book>
                   ......
  </booklist>

I will get this xml doc each month and I'd like query for things like
            Which books sold the most last month
            Which Book has the most sold copies (need to add 
copiesSoldLastMonth from each doc)
            Which books have been added to the list
            Which books have been removed from this list

I've also been reading through Xquery and I do not see how to do this or if any 
database has facilities to support this kind of thing.

Thanks for any pointers,
jonathan
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