Completed Xquery for multiple for loops

I have the input request like below

<Input>
<BusinessObjects>
      <BusinessObject>
        <BusinessIdentifiers>
          <BusinessIdentifier>
            <BKey>BuCode</BKey>
            <BValue>CDC</BValue>
          </BusinessIdentifier>
          <BusinessIdentifier>
            <BKey>BuType</BKey>
            <BValue>123</BValue>
          </BusinessIdentifier>
          <BusinessIdentifier>
            <BKey>CsmNo</BKey>
            <BValue>857895</BValue>
          </BusinessIdentifier>
        </BusinessIdentifiers>
       </BusinessObject>
      <BusinessObject>
        <BusinessIdentifiers>
          <BusinessIdentifier>
            <BKey>BuCode</BKey>
            <BValue>CDC</BValue>
          </BusinessIdentifier>
          <BusinessIdentifier>
            <BKey>BuType</BKey>
            <BValue>123</BValue>
          </BusinessIdentifier>
          <BusinessIdentifier>
            <BKey>CsmNo</BKey>
            <BValue>34567</BValue>
          </BusinessIdentifier>
        </BusinessIdentifiers>
        </BusinessObject>      
    </BusinessObjects>
    </Input>

i need to form an output like below schema

<Output>
<BusinessObject>
<BIKey></BIKey>
<BKey></BIKey>
<Bvalue></Bvalue>
<BOID></BOID>
</BusinessObject>
</Output>

For the above payload The output should be

<Output>
<BusinessObjects>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>BUCode</BKey>
<Bvalue>CDC</Bvalue>
<BOID>CDC:123:857895</BOID>
</BusinessObject>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>BUtype</BKey>
<Bvalue>123</Bvalue>
<BOID>CDC:123:857895</BOID>
</BusinessObject>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>CSMNo</BKey>
<Bvalue>857895</Bvalue>
<BOID>CDC:123:857895</BOID>
</BusinessObject>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>BUCode</BKey>
<Bvalue>CDC</Bvalue>
<BOID>CDC:123:34567</BOID>
</BusinessObject>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>BUtype</BKey>
<Bvalue>123</Bvalue>
<BOID>CDC:123:34567</BOID>
</BusinessObject>
<BusinessObject>
<BIKey>CDC:123:857895|CDC:123:34567</BIKey>
<BKey>CSMNo</BKey>
<Bvalue>857895</Bvalue>
<BOID>CDC:123:34567</BOID>
</BusinessObject>
</BusinessObjects>
</Output>

i have tried below Xquery to get the same but ended up with errors or not meeting the requiremnt

<Ouput>
<BusinessObjects>
{
for $bi in Input/BusinessObjects/BusinessObject/BusinessIdentifiers/BusinessIdentifier
return
<BIKey>
    {
        string-join(
            for $bo in Input/BusinessObjects/BusinessObject return string-join($bo/BusinessIdentifiers/BusinessIdentifier/BValue, '|'),
            ':'
        )
    }
    </BIKey>
    <BKey>data {$bi/Bkey}</BKey>
    <Bvalue>data {$bi/Bvalue}</Bvalue>
    for $bo in Input/BusinessObjects/BusinessObject return <BOID>{string-join($bo//BValue, ':')}<BOID>

}
</BusinessObjects>
</Ouput>

the description for the output fields as follows BIKey-->it has formed with all the Bvalues of 'Business Identifier' concatenated with ':' and then for each businessobject it is separed with '|' Bkey-->Straight mapping with bkey Bvalue-->Straight mapping with Bvalue BOID--> it has to formed for each businessobject, need to concatenate the values Bvalues of Business Identifiers with ':' Any suggestions, i believe that i have to two complex loops in here, but not able to crack it.

Thanks

With the query

<Output>
    <BusinessObjects>
        {
            //BusinessIdentifier 
            ! 
            <BusinessObject>
                <BIKey>{string-join(ancestor::BusinessObjects/BusinessObject!string-join(.//BValue, ':'), '|')}</BIKey>
                {
                    BKey, 
                    BValue
                }
                <BOID>{ancestor::BusinessObject!string-join(.//BValue, ':')}</BOID>
            </BusinessObject>
        }
    </BusinessObjects>
</Output>

at https://xqueryfiddle.liberty-development.net/948Fn5g I get the result

<Output>
   <BusinessObjects>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>BuCode</BKey>
         <BValue>CDC</BValue>
         <BOID>CDC:123:857895</BOID>
      </BusinessObject>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>BuType</BKey>
         <BValue>123</BValue>
         <BOID>CDC:123:857895</BOID>
      </BusinessObject>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>CsmNo</BKey>
         <BValue>857895</BValue>
         <BOID>CDC:123:857895</BOID>
      </BusinessObject>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>BuCode</BKey>
         <BValue>CDC</BValue>
         <BOID>CDC:123:34567</BOID>
      </BusinessObject>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>BuType</BKey>
         <BValue>123</BValue>
         <BOID>CDC:123:34567</BOID>
      </BusinessObject>
      <BusinessObject>
         <BIKey>CDC:123:857895|CDC:123:34567</BIKey>
         <BKey>CsmNo</BKey>
         <BValue>34567</BValue>
         <BOID>CDC:123:34567</BOID>
      </BusinessObject>
   </BusinessObjects>
</Output>

In XQuery 1 you don't have the ! simple map operator but you should be able to use for .. return instead, see https://xqueryfiddle.liberty-development.net/948Fn5g/1 with

<Output>
    <BusinessObjects>
        {
            for $bi in //BusinessIdentifier 
            return  
            <BusinessObject>
                <BIKey>{string-join($bi/ancestor::BusinessObjects/BusinessObject/string-join(.//BValue, ':'), '|')}</BIKey>
                {
                    $bi/BKey, 
                    $bi/BValue
                }
                <BOID>{$bi/ancestor::BusinessObject/string-join(.//BValue, ':')}</BOID>
            </BusinessObject>
        }
    </BusinessObjects>
</Output>

or simple steps constructing a new element, see https://xqueryfiddle.liberty-development.net/948Fn5g/2 with

<Output>
    <BusinessObjects>
        {
            //BusinessIdentifier/
            <BusinessObject>
                <BIKey>{string-join(ancestor::BusinessObjects/BusinessObject/string-join(.//BValue, ':'), '|')}</BIKey>
                {
                    BKey, 
                    BValue
                }
                <BOID>{ancestor::BusinessObject/string-join(.//BValue, ':')}</BOID>
            </BusinessObject>
        }
    </BusinessObjects>
</Output>