output application/xml writeNilOnNull=true
---
users: {
    user @((name: "Mariano") if (in0.male), age: 31) : "Achaval",
    user @((name: "Maria") if in0.female, age: 31) : "Cantos",
    country: { c @((loc: "Arg") if true) : {}}.c.@loc,
    country: { c @((loc: "Arg") if false) : {}}.c.@loc
}