Xquery Transformation with filter

Question

Hi,
I am trying to implement a specific transformation: I need to filter an object on a key.
As input, I have this structure :
<STRUCTURE>
  <item>   // multiplicy : *
    <MONTH>
    <INDICATOR />
    <LETA/>
  </item>
</OBJECT_1>
<OBJECT_2>
  <item>   // multiplicy : *
    <ORDER_NUMBER/>
    <ORDER_LINE_NUMBER/>
    <MONTH />
  </item>
</OBJECT_2>
</STRUCTURE>
Here is an example :
<STRUCTURE>
   <OBJECT_1>
      <item>
         <MONTH>2013_M06</MONTH>
         <INDICATOR>ABC</INDICATOR>
         <LETA>2012-04-24</LETA>
      </item>
      <item>
         <MONTH>2013_M05</MONTH>
         <INDICATOR>DEF</INDICATOR>
         <LETA>2012-04-24</LETA>
      </item>
   </OBJECT_1>
   <OBJECT_2>
      <item>
         <MONTH>2013_M06</MONTH>
         <ORDER_NUMBER>11111</ORDER_NUMBER>
         <ORDER_LINE_NUMBER>1</ORDER_LINE_NUMBER>
      </item>
      <item>
         <MONTH>2013_M06</MONTH>
         <ORDER_NUMBER>11111</ORDER_NUMBER>
         <ORDER_LINE_NUMBER>2</ORDER_LINE_NUMBER>
      </item>
      <item>
         <MONTH>2013_M05</MONTH>
         <ORDER_NUMBER>22222</ORDER_NUMBER>
         <ORDER_LINE_NUMBER>1</ORDER_LINE_NUMBER>
      </item>
   </OBJECT_2>
</STRUCTURE>
I need to have this result :
<targetStructure>
   <object1>
         <month>2013_M06</month>
         <indicator>ABC</indicator>
         <leta>2012-04-24</leta>
          <object2>
             <orderNumber>11111</orderNumber>
             <orderLineNumber>1</orderLineNumber>
          </object2>
          <object2>
             <orderNumber>11111</orderNumber>
             <orderLineNumber>2</orderLineNumber>
          </object2>
      </object1>
      <object1>
         <month>2013_M05</month>
         <indicator>DEF</indicator>
         <leta>2012-04-24</leta>
         <object2>
             <orderNumber>22222</orderNumber>
             <orderLineNumber>1</orderLineNumber>
          </object2>
      </object1>
   </object1>
</targetStructure>
My XQ transformation is like this :
(:: pragma bea:global-element-parameter parameter="$STRUCTURE" element="ns1:STRUCTURE" location="xxx" ::)
(:: pragma bea:global-element-return element="ns0:targetStructure" location="xxy" ::)
declare namespace ns1 = "urn:aa";
declare namespace ns0 = "http://vvv.com";
declare namespace xf = "http://tempuri.org/cc/";
declare function xf:myTransformation($z_STRUCTURE1 as element(ns1:STRUCTURE))
    as element(ns0:targetStructure)
<targetStructure>
                    for $item in $z_STRUCTURE1/ns1:OBJECT_1/ns1:item
                    return
                        <object1>
                                for $MONTH in $item/ns1:MONTH
                                return
                                    <month>{ data($MONTH) }</month>
                                for $INDICATOR in $item/ns1:INDICATOR
                                return
                                    <indicator>{ data($INDICATOR) }</indicator>
                                for $LETA in $item/ns1:LETA
                                return
                                    <month>{ data($LETA) }</month>
                                for $item0 in $STRUCTURE/ns1:OBJECT_1/ns1:item
                                return
                                    <object2>
                                           for $ORDER_NUMBER in $item/ns1:ORDER_NUMBER
                                           return
                                                 <orderNumber>{ data($ORDER_NUMBER) }</orderNumber>
                                          for $ORDER_LINE_NUMBER in $item/ns1:ORDER_LINE_NUMBER
                                          return
                                               <orderLineNumber>{ data($ORDER_LINE_NUMBER) }</orderLineNumber>
                                   </object2>
</targetStructure>
As you can see, I got all object2 in each object1, while I only need the object2 where the MONTH is equal to the object1 one...
I tried to replace line 32 by
for $item0 in $STRUCTURE/ns1:OBJECT_1/ns1:item[ns1:month=$item/ns1:MONTH/text()]
... or some declinaisons, but I never got what I expected...
Any ideas ?
Regards

Answer 1

Use the below xquery:-
xquery version "1.0" encoding "Cp1252";
(:: pragma  parameter="$anyType1" type="xs:anyType" ::)
(:: pragma  type="xs:anyType" ::)
declare namespace xf = "http://tempuri.org/OSB%20Project%201/XQ/Test2/";
declare function xf:Test2($anyType1 as element(*))
    as element(*) {
       let $input:= <STRUCTURE> 
   <OBJECT_1> 
      <item> 
         <MONTH>2013_M06</MONTH> 
         <INDICATOR>ABC</INDICATOR> 
         <LETA>2012-04-24</LETA> 
      </item> 
      <item> 
         <MONTH>2013_M05</MONTH> 
         <INDICATOR>DEF</INDICATOR> 
         <LETA>2012-04-24</LETA> 
      </item> 
   </OBJECT_1> 
   <OBJECT_2> 
      <item> 
         <MONTH>2013_M06</MONTH> 
         <ORDER_NUMBER>11111</ORDER_NUMBER> 
         <ORDER_LINE_NUMBER>1</ORDER_LINE_NUMBER> 
      </item> 
      <item> 
         <MONTH>2013_M06</MONTH> 
         <ORDER_NUMBER>11111</ORDER_NUMBER> 
         <ORDER_LINE_NUMBER>2</ORDER_LINE_NUMBER> 
      </item> 
      <item> 
         <MONTH>2013_M05</MONTH> 
         <ORDER_NUMBER>22222</ORDER_NUMBER> 
         <ORDER_LINE_NUMBER>1</ORDER_LINE_NUMBER> 
      </item> 
   </OBJECT_2> 
</STRUCTURE>
let $month := fn:distinct-values($input/OBJECT_1//MONTH/text())
let $out:=<targetStructure>{
  for $x in 1 to fn:count($month)
  return
  <object1>
  <month>{$month[$x]}</month>
  <indicator>{$input/OBJECT_1/item[./MONTH=$month[$x]]/INDICATOR/text()}</indicator>
  <leta>{$input/OBJECT_1/item[./MONTH=$month[$x]]/LETA/text()}</leta>
  {for $y in $input/OBJECT_2/item
  where $y/MONTH/text()=$month[$x]
  return
  <object2>
  <orderNumber>{$y/ORDER_NUMBER/text()}</orderNumber>
  <orderLineNumber>{$y/ORDER_LINE_NUMBER/text()}</orderLineNumber>
  </object2>}
  </object1>
</targetStructure>
return $out
declare variable $anyType1 as element(*) external;
xf:Test2($anyType1)