xquery tranformation to embedded type - xquery

Question

I'm writing an .xq transformation for osb service:
I have the following structure of tags:
<case>
<segment> Earth </segment>
<subSegment> Africa </subSegment>
<complexType>
<param1> values1 </param1>
<param2> values2 </param2>
</complexType>
</case>
I would like to map them correspondingly to
<case>
<complexType>
<segment> Earth </segment>
<subSegment> Africa </subSegment>
<param1> values1 </param1>
<param2> values2 </param2>
</complexType>
</case>
such that if content in segment/subSegment/param1/param2 is empty of these tags are not present (simultaneously) at all, there will be no complexType tags after transformation:
<case>
</case>
So, when I do smth like that:
{let $complexType := $cc/ns1:case/ns2:complexType
return
<ns3:complexType>
{
for $segment in $cc/ns1:case/ns2:segment
return <ns3:segment>{ data($segment) }</ns3:segment>
}
{
for $subSegment in $cc/ns1:case/ns2:subSegment
return <ns3:subSegment>{ data($subSegment) }</ns3:subSegment>
}
{
for $param1 in $complexType/ns2:param1
return <ns3:param1>{ data($param1) }</ns3:param1>
}
{
for $param2 in $complexType/ns2:param2
return <ns3:param2>{ data($param2) }</ns3:param2>
}
}
It almost does the job but in case everything is empty or not present it still returns empty complexType tag:
<case>
<complexType></complexType>
</case>
Please, give me a hint about how to fix this. Thanks!

Answer 1

Bind all your elements to a variable and then you can simply check whether this sequence of elements is empty or not. Something along the lines of this:
{let $complexType := $cc/ns1:case/ns2:complexType
let $elements := (
for $segment in $cc/ns1:case/ns2:segment
return <ns3:segment>{ data($segment) }</ns3:segment>,
for $subSegment in $cc/ns1:case/ns2:subSegment
return <ns3:subSegment>{ data($subSegment) }</ns3:subSegment>,
for $param1 in $complexType/ns2:param1
return <ns3:param1>{ data($param1) }</ns3:param1>,
for $param2 in $complexType/ns2:param2
return <ns3:param2>{ data($param2) }</ns3:param2>
)
return
if (exists($elements))
then <ns3:complexType>{ $elements } </ns3:complexType>
else ()
}