Marshalling JSON to XML with jsonix gives invalide XML - node.js

Question

I need to send a xml request to an api for my project. But for security reasons, I cannon't code direct xml in my program. So I decided to use jsonix to marshal JSON to xml, and unmarshal the respond of the request. But I have some problemes.
Here is my xml:
<?xml version = '1.0' encoding='UTF-8'?>
<api>
<authentication>
<login>MyLogin</login>
<password>MyPassword</password>
</authentication>
<command>
<myfunction>
<name>test</name>
</myfunction>
</command>
</api>
With this, I have generated the Mappings with the jsonix-schema-compiler module:
var Search_Module_Factory = function () {
var Search = {
name: "Search",
typeInfos: [{
localName: "Api.Command",
typeName: null,
propertyInfos: [{
name: "myFunction",
required: true,
elementName: {
localPart: "myfunction"
},
typeInfo: ".Api.Command.MyFunction"
}]
}, {
localName: "Api.Authentication",
typeName: null,
propertyInfos: [{
name: "login",
required: true,
elementName: {
localPart: "login"
}
}, {
name: "password",
required: true,
elementName: {
localPart: "password"
}
}]
}, {
localName: "Api.Command.MyFunction",
typeName: null,
propertyInfos: [{
name: "name",
required: true,
elementName: {
localPart: "name"
}
}]
}, {
localName: "Api",
typeName: null,
propertyInfos: [{
name: "authentication",
required: true,
elementName: {
localPart: "authentication"
},
typeInfo: ".Api.Authentication"
}, {
name: "command",
required: true,
elementName: {
localPart: "command"
},
typeInfo: ".Api.Command"
}]
}],
elementInfos: [{
typeInfo: ".Api",
elementName: {
localPart: "api"
}
}]
};
return {
Search: Search
};
};
if (typeof define === "function" && define.amd) {
define([], Search_Module_Factory);
}
else {
var Search_Module = Search_Module_Factory();
if (typeof module !== "undefined" && module.exports) {
module.exports.Search = Search_Module.Search;
}
else {
var Search = Search_Module.Search;
}
}
In my main code, I am marshalling the xml request like this:
var Search = require("./mappings/Search").Search;
var context = new Jsonix.Context([ Search]);
var marshaller = context.createMarshaller();
var originalJS = {
"api": {
"authentication": {
"login" :"mylogin",
"password": "mypassword",
},
"command":{
"myfunction":{
"name": "test"
}
},
}
};
var marshalledXML = marshaller.marshalString(originalJS);
console.log(marshalledXML);
And in the console.log(), instead of showing me something like this, which is the result I want:
<api><authentication><login>mylogin</login><password>mypassword</password></authentication><command><myfunction><name>test</name></myfunction></command></api>
It's returning something like this:
<api><authentication><login>mylogin</login><password>mypassword</password></authentication><command/></api>
The tag command is always empty, and I don't understand what I'm doing wrong.
Thank for your help