output application/xml writeNilOnNull=true, skipNullOn="attributes"
---
{
  users:
  {
    user @(age: 31,dni: 30181626): {
      name: "Mariano",
      lastName: "Achaval",
      contacts: {}
    },
    user @(age: 33, dni: null): {
      name: "Emiliano",
      lastName: "Lesende",
      contacts: {
        contact: {
          name: "Uri S."
        },
        contact: {
          name: "Dan D."
        }
      }
    },
    user: {
      name: "Luis",
      lastName: null
    }
  }
}