Query Through Multiple Files

[John Snelson]

Hi Alice,

You basically have a grouping problem to solve, which can be done like this:

let $addresses := (doc("1.xml") | doc("3.xml") |
   doc("4.xml") | doc("2.xml"))//ad/p/address
let $sorted_result:=
   for $doc in distinct-values($addresses)
   order by $doc ascending
   return $doc
for $r at $count in $sorted_result
let $nodes := $addresses[. = $r]
return
   <bibl>
     <statistics>
       Showing Result: {$count} / {count($sorted_result)}
     </statistics>
     {$nodes}
   </bibl>

John

Wei, Alice J. wrote:
> Hi, Michael:
> 
>  
> 
>   Sorry, but that is not entirely what I want. I was hoping to not just 
> keep the information but also the markup. Is there some way I can do that?
> 
>  This means that I should not be using distinct-values() because it is 
> similar to <xsl:value-of select=""> as in XSLT, right?
> 
>  
> 
> Here is the code again:
> 
>  
> 
> declare boundary-space preserve;
> 
>  
> 
> <book>
> 
> {
> 
> let $sorted_result:= for $doc in
> 
> distinct-values((doc("1.xml"),doc("3.xml"),
> 
> doc("4.xml"), doc("2.xml"))//ad/p/address)
> 
> order by $doc ascending
> 
> return $doc
> 
> for $sorted_results at $count in $sorted_result
> 
> return
> 
> <bibl>
> 
> <statistics>Showing Result: {$count} / {count($sorted_result)}
> 
> </statistics>
> 
> {$sorted_result}
> 
> </bibl>
> 
> }
> 
> </book>
> 
>  
> 
> Thanks for your help.
> 
>  
> 
> ======================================================
> 
> Alice Wei
> 
> MIS 2008
> 
> School of Library and Information Science
> 
> Indiana University Bloomington
> 
> http://x-query.com/mailman/listinfo/talk <mailto:http://x-query.com/mailman/listinfo/talk>
> 
>  
> 
> -----Original Message-----
> From: Michael Kay [mailto:http://x-query.com/mailman/listinfo/talk]
> Sent: Monday, January 21, 2008 4:04 PM
> To: Wei, Alice J.; 'Liam Quin'
> Cc: http://x-query.com/mailman/listinfo/talk
> Subject: RE:  Query Through Multiple Files
> 
>  
> 
>  
> 
>  
> 
>  > I tried using
> 
>  > distinct-values(doc("1.xml"), doc("3.xml"), doc("4.xml"),
> 
>  > doc("2.xml"))//title, but I got the error that there should
> 
>  > be only 2 arguments.
> 
>  
> 
> You didn't read my example carefully enough
> 
>  
> 
> distinct-values(( doc("1.xml"),
> 
>   doc("2.xml"),
> 
>   doc("3.xml"),
> 
>   doc("4.xml"))//ad)
> 
>  
> 
> Firstly, you want to find the set of titles and then take the distinct
> 
> values in this set: so the "//title" part needs to inside the argument to
> 
> distinct-values(). The way you've written it, you're taking four documents,
> 
> then eliminating duplicates, then taking the title elements within those
> 
> that are left.
> 
>  
> 
> Secondly, if you supply a sequence to a function that expects a single
> 
> argument then you need to double the parentheses, for example
> 
> sum((1,2,3,4,5)) or distinct-values((1,2,2,4,4)). That's to make it clear
> 
> you are passing one argument which is a sequence of five integers, not five
> 
> arguments that are single integers. IN your case you've called
> 
> distinct-values() with four arguments, rather than with a single argument
> 
> that is a sequence.
> 
>  
> 
> Michael Kay
> 
> http://www.saxonica.com/
> 
>  
> 
>  
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
John Snelson, Oracle Corporation            http://snelson.org.uk/john
Berkeley DB XML:        http://www.oracle.com/database/berkeley-db/xml
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