HTTP + XML
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
POST /xml/reply/GetGroupedCategoriesRequest HTTP/1.1 
Host: api-beta.ghs-automotive.nl 
Content-Type: application/xml
Content-Length: length
<GetGroupedCategoriesRequest xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/S1.Api.Domain.Models.Admin.Categories" />
 
HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: length
<ArrayOfGroupedCategoriesAdminModel xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/S1.Api.Domain.Models.Admin.Categories">
  <GroupedCategoriesAdminModel>
    <Categories i:nil="true" />
    <GroupId>0</GroupId>
    <GroupName>String</GroupName>
  </GroupedCategoriesAdminModel>
</ArrayOfGroupedCategoriesAdminModel>