[Exist-open] merging XML

[Alfredo C. <alf...@gm...>]

Hi all,
I'm working on eXist 4.7
The problem is:

I have tre variables with XML code:

let $var1 := <fileDesc>
<sourceDesc>
<msDesc>
<physDesc>
<objectDesc form=""/>
</physDesc>
</msDesc>
</sourceDesc>
</fileDesc>


let var2 :=  <fileDesc>
<sourceDesc>
<msDesc>
<msIdentifier>
<idno/>
</msIdentifier>
</msDesc>
</sourceDesc>
</fileDesc>

let var3 := <fileDesc>
<titleStmt>
<title/>
</titleStmt>
</fileDesc>

How can I merge there 3 snapshots and obtain something like:

<fileDesc>
   <titleStmt>
   <title/>
   </titleStmt>
<sourceDesc>
<msDesc>
<physDesc>
  <objectDesc form=""/>
  </physDesc>
<msIdentifier>
  <idno/>
  </msIdentifier>
  </msDesc>
  </sourceDesc>
</fileDesc>


Thanks,
Alfredo