xslt/xquery for checking values of two attributes in if conditions - for-loop

Question

I am stuck at a place in my xquery. In the response i want to get back the phone numbers for each Type i.e. HOME and CELL , but only the ones which have highest sequence number .If there are two rows with PhoneType="HOME" , I want back the phone which has highest sequence of two i.e in my case Sequence="3".
With my xquery I am able to get back a phoneType="HOME" and the first row with type HOME. i am not able to add a condition to check the Sequence as well. Where and how can i add it. Please suggest. Thanks in advance
Part of my Xquery:
<acc:phones>
{
for $PersonPhonesRow in $PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow[#PhoneType="HOME"][1]
return
if(fn:data($PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow/#PhoneType="HOME"[1]))
then
<com:phone>
<com:type>{'HOME'}</com:type>
<com:phoneNumber>{fn:data($PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow[#PhoneType="HOME"][1]/#PhoneNumber)}</com:phoneNumber>
<com:carrier>{fn:data($PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow[#PhoneType="HOME"][1]/#Extension)}</com:carrier>
</com:phone>
else
()
}
</acc:phones>
Request:
<CMPerson xmlns="http://splwg.com/CMPerson.xsd">
<CMPersonService>
<CMPersonDetails>
<PersonPhones>
<PersonPhonesHeader PersonID="1234567890" LastSequenceNumber="9"/>
<PersonPhonesRow PersonID="1234567890" Sequence="1" PhoneType="HOME" IntlPrefix="" PhoneNumber="[phone]" Extension="" Version="12" PhoneAlgorithmParamValue="[phone]"/>
<PersonPhonesRow PersonID="1234567890" Sequence="2" PhoneType="CELL" IntlPrefix="" PhoneNumber="[phone]" Extension="" Version="3" PhoneAlgorithmParamValue="[phone]"/>
<PersonPhonesRow PersonID="1234567890" Sequence="3" PhoneType="HOME" IntlPrefix="" PhoneNumber="[phone]" Extension="ATT" Version="1" PhoneAlgorithmParamValue="[phone]"/>
<PersonPhonesRow PersonID="1234567890" Sequence="4" PhoneType="BUSN" IntlPrefix="" PhoneNumber="[phone]" Extension="" Version="3" PhoneAlgorithmParamValue="[phone]"/>
</PersonPhones>
</CMPersonDetails>
</CMPersonService>
</CMPerson>
Response required:
<acc:phones>
<com:phone xmlns:com="******">
<com:type>HOME</com:type>
<com:phoneNumber>[phone]</com:phoneNumber>
<com:carrier>ATT</com:carrier>
</com:phone>
<com:phone xmlns:com="******">
<com:type>CELL</com:type>
<com:phoneNumber>[phone]</com:phoneNumber>
<com:carrier></com:carrier>
</com:phone>
</acc:phones>

Answer 1

Query to be used:
let $PersonMaintenanceResponse := 'Your request'
let $uniqPhoneType :=distinct-values($PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow/#PhoneType)
for $each at $i in $uniqPhoneType
return
<acc:phones>
{
let $seq := $PersonMaintenanceResponse/ns2:CMPersonService/ns2:CMPersonDetails/ns2:PersonPhones/ns2:PersonPhonesRow[(#PhoneType = $each)]
let $maxValue := max($seq/#Sequence)
let $maxrow := $seq[#Sequence eq $maxValue]
return
<com:phone xmlns:com="*******">
<com:type>{$each}</com:type>
<com:phoneNumber>{$maxrow/#PhoneNumber}</com:phoneNumber>
<com:carrier>{$maxrow/#Extension}</com:carrier>
</com:phone>
}</acc:phones>