XQuery - Two if's in a for loop

Can I have multiple if's in a for loop?
I have input xml. I need to do XQuery
transformation to form output xml based on 
occurance of elements in input xml
Input xml: 
<?xml version="1.0" encoding="UTF-8"?>
<tns:InputMSG1
xsi:schemaLocation="http://xmlns.aaa.com InputMSG.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns2="http://xmlns.aaa.org" xmlns:tns="http://xmlns.aaa.org">
 <tns:CustNum>111</tns:CustNum>
 <tns:ReturnParameter>
  <tns:ReturnParameterCode>ONE</tns:ReturnParameterCode>
  <tns:ReturnParameterCode>TWO</tns:ReturnParameterCode>
 </tns:ReturnParameter>
</tns:InputMSG1>

If ReturnParameterCode is "ONE",
then block <ONE> should appear in the output
if ReturnParameterCode = TWO is
present then block <TWO> should appear. 

My output should be: 
<?xml
version="1.0" encoding="UTF-8"?>
<tns:OutputMSG1
xsi:schemaLocation="http://xmlns.aaa.com InputMSG.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns2="http://xmlns.aaa.org" xmlns:tns="http://xmlns.aaa.com">
 <tns:ONE>
  <tns:Id>String</tns:Id>
  <tns:Number>String</tns:Number>
 </tns:ONE>  
 <tns:TWO>
  <tns:Name>String</tns:Name>
 </tns:TWO>
</tns:OutputMSG1>

IF
input xml doesn't have 
<tns:ReturnParameterCode>TWO</tns:ReturnParameterCode>, block <TWO> shouldn't
appear in the output. 

<?xml version="1.0" encoding="UTF-8"?>
<tns:InputMSG1
xsi:schemaLocation="http://xmlns.aaa.com InputMSG.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns2="http://xmlns.aaa.org" xmlns:tns="http://xmlns.aaa.org">
 <tns:CustNum>111</tns:CustNum>
 <tns:ReturnParameter>
  <tns:ReturnParameterCode>ONE</tns:ReturnParameterCode>
 </tns:ReturnParameter>
</tns:InputMSG1>
My output should be: 
<?xml
version="1.0" encoding="UTF-8"?>
<tns:OutputMSG1
xsi:schemaLocation="http://xmlns.aaa.com InputMSG.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns2="http://xmlns.aaa.org" xmlns:tns="http://xmlns.aaa.com">
 <tns:ONE>
  <tns:Id>String</tns:Id>
  <tns:Number>String</tns:Number>
 </tns:ONE>  
</tns:OutputMSG1>