{
  "name"    : "test-workflow",
  "services": [{
    "name": ["1"],
    "srv" : ["echo"],
    "in"  : ["!"],
    "dst" : ["2"]
  }, {
    "name": ["2"],
    "srv" : ["echo"],
    "in"  : ["?"],
    "src" : ["1"]
  }]
}