To override the Content-type in your clients, use the HTTP Accept Header, append  the .xml suffix or  ?format=xml
        
        HTTP + XML
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
POST /api/scheduling/reservations HTTP/1.1 
Host: cpo.hostedsuite.com 
Accept: application/xml
Content-Type: application/xml
Content-Length: length
<ListReservationsRequest xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Evo.HostedSuite.Core.ServiceModel">
  <CustomerName>String</CustomerName>
  <Password>String</Password>
  <UserName>String</UserName>
  <CenterId>String</CenterId>
  <ClientId>String</ClientId>
  <EndTime>String</EndTime>
  <LastModifiedAfter>String</LastModifiedAfter>
  <LastModifiedBefore>String</LastModifiedBefore>
  <MeetingRoomIds xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
    <d2p1:string>String</d2p1:string>
  </MeetingRoomIds>
  <PaymentStatus>None</PaymentStatus>
  <StartTime>String</StartTime>
  <Status>Scheduled</Status>
</ListReservationsRequest>
 
HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: length
<ArrayOfReservationInfo xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Evo.HostedSuite.Core.ServiceModel">
  <ReservationInfo>
    <Attendees>
      <AttendeeInfo>
        <EmailAddress>String</EmailAddress>
        <Name>String</Name>
      </AttendeeInfo>
    </Attendees>
    <CenterAddress>String</CenterAddress>
    <CenterId>String</CenterId>
    <CenterName>String</CenterName>
    <ClientId>String</ClientId>
    <ClientName>String</ClientName>
    <CustomFields>
      <CustomFieldInfo>
        <Name>String</Name>
        <Value>String</Value>
      </CustomFieldInfo>
    </CustomFields>
    <DateLastModified>String</DateLastModified>
    <EndTime>String</EndTime>
    <EntityStatus>String</EntityStatus>
    <Id>String</Id>
    <IsRecurring>false</IsRecurring>
    <LastModifiedBy>String</LastModifiedBy>
    <MeetingRoomId>String</MeetingRoomId>
    <MeetingRoomName>String</MeetingRoomName>
    <Notes>String</Notes>
    <NumAttendees>0</NumAttendees>
    <Organizer>
      <EmailAddress>String</EmailAddress>
      <Name>String</Name>
    </Organizer>
    <OriginalDate>String</OriginalDate>
    <PaymentStatus>String</PaymentStatus>
    <StartTime>String</StartTime>
    <Status>String</Status>
    <Subject>String</Subject>
  </ReservationInfo>
</ArrayOfReservationInfo>