XQuery needed

catalog.xml

<catalog>
  <product dept="WMN">
    <number>557</number>
    <name language="en">Fleece Pullover</name>
    <colorChoices>navy black</colorChoices>
  </product>
  <product dept="ACC">
    <number>563</number>
    <name language="en">Floppy Sun Hat</name>
  </product>
  <product dept="ACC">
    <number>443</number>
    <name language="en">Deluxe Travel Bag</name>
  </product>
  <product dept="MEN">
    <number>784</number>
    <name language="en">Cotton Dress Shirt</name>
    <colorChoices>white gray</colorChoices>
    <desc>Our <i>favorite</i> shirt!</desc>
  </product>
</catalog>

Orders.xml

<order num="00299432" date="2015-09-15" cust="0221A">
  <item dept="WMN" num="557" quantity="1" color="navy"/>
  <item dept="ACC" num="563" quantity="1"/>
  <item dept="ACC" num="443" quantity="2"/>
  <item dept="MEN" num="784" quantity="1" color="white"/>
  <item dept="MEN" num="784" quantity="1" color="gray"/>
  <item dept="WMN" num="557" quantity="1" color="black"/>
</order>

Prices.XML

<prices>
  <priceList effDate="2015-11-15">
    <prod num="557">
      <price currency="USD">29.99</price>
      <discount type="CLR">10.00</discount>
    </prod>
    <prod num="563">
      <price currency="USD">69.99</price>
    </prod>
    <prod num="443">
      <price currency="USD">39.99</price>
      <discount type="CLR">3.99</discount>
    </prod>
  </priceList>
</prices>

3)
file: prod_ns.xml
-->
<prod:product xmlns:prod="xxxxx">
  <prod:number>563</prod:number>
  <prod:name language="en">Floppy Sun Hat</prod:name>
</prod:product>

<!-- 



xquery version "3.0";
declare namespace prod = "xxxx";
for $prod in doc("prod_ns.xml")/prod:product
return $prod/prod:name

-->

###############################################################3

Need X-path query to show results as below

Result 1:
<result dept="WMN" number="557"/>
<result dept="ACC" number="563"/>
<result dept="ACC" number="443"/>
<result dept="MEN" number="784"/>

Result 2:
<item num="557" name="Fleece Pullover" price="29.99"/>
<item num="563" name="Floppy Sun Hat" price="69.99"/>
<item num="443" name="Deluxe Travel Bag" price="39.99"/>
<item num="557" name="Fleece Pullover" price="29.99"/>

Result 3:
<product number="557" price="29.99"/>
<product number="563" price="69.99"/>
<product number="443" price="39.99"/>
<product number="784" price=""/>

Result 4:
<department code="ACC">
<item dept="ACC" num="443" quantity="2"/>
<item dept="ACC" num="563" quantity="1"/>
</department>
<department code="MEN">
<item dept="MEN" num="784" quantity="1" color="white"/>
<item dept="MEN" num="784" quantity="1" color="gray"/>
</department>
<department code="WMN">
<item dept="WMN" num="557" quantity="1" color="navy"/>
<item dept="WMN" num="557" quantity="1" color="black"/>
</department>

Result 5:
<department code="ACC" numItems="2" distinctItemNums="2" totQuant="3"/>
<department code="MEN" numItems="2" distinctItemNums="1" totQuant="2"/>
<department code="WMN" numItems="2" distinctItemNums="1" totQuant="2"/>