Slurs (targeting specific notes)

See also: This same example in MusicXML
{
   "mnx": {
      "version": 1
   },
   "global": {
      "measures": [
         {
            "time": {
               "count": 4,
               "unit": 4
            }
         }
      ]
   },
   "parts": [
      {
         "measures": [
            {
               "clefs": [
                  {
                     "clef": {
                        "sign": "G",
                        "staffPosition": -2
                     }
                  }
               ],
               "sequences": [
                  {
                     "content": [
                        {
                           "id": "ev1",
                           "duration": {
                              "base": "half"
                           },
                           "notes": [
                              {
                                 "id": "note1",
                                 "pitch": {
                                    "octave": 5,
                                    "step": "C"
                                 }
                              },
                              {
                                 "id": "note2",
                                 "pitch": {
                                    "octave": 5,
                                    "step": "E"
                                 }
                              },
                              {
                                 "id": "note3",
                                 "pitch": {
                                    "octave": 5,
                                    "step": "G"
                                 }
                              }
                           ],
                           "slurs": [
                              {
                                 "endNote": "note4",
                                 "side": "down",
                                 "startNote": "note1",
                                 "target": "ev2"
                              },
                              {
                                 "endNote": "note5",
                                 "side": "up",
                                 "startNote": "note2",
                                 "target": "ev2"
                              },
                              {
                                 "endNote": "note6",
                                 "side": "up",
                                 "startNote": "note3",
                                 "target": "ev2"
                              }
                           ]
                        },
                        {
                           "id": "ev2",
                           "duration": {
                              "base": "half"
                           },
                           "notes": [
                              {
                                 "id": "note4",
                                 "pitch": {
                                    "octave": 4,
                                    "step": "B"
                                 }
                              },
                              {
                                 "id": "note5",
                                 "pitch": {
                                    "octave": 5,
                                    "step": "D"
                                 }
                              },
                              {
                                 "id": "note6",
                                 "pitch": {
                                    "octave": 5,
                                    "step": "F"
                                 }
                              }
                           ]
                        }
                     ]
                  }
               ]
            }
         ]
      }
   ]
}