JSON_Schema_experiment

Here's a light first stab at a formal JSON Schema for JSON MNX. The goal is really to get a feel for JSON Schema and see whether it will work for our project.

See json-schema.org for more on JSON Schema.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://w3c.github.io/mnx/schema.json",
  "title": "MNX document",
  "description": "An encoding of Common Western Music Notation.",
  "type": "object",
  "properties": {
    "global": {
      "type": "object",
      "properties": {
        "measures": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "key": {
                "type": "object",
                "properties": {
                  "fifths": {
                    "type": "integer"
                  }
                },
                "required": ["fifths"]
              },
              "time": {
                "type": "object",
                "properties": {
                  "signature": {
                    "type": "string"
                  }
                },
                "required": ["signature"]
              }
            }
          }
        },
        "styles": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "selector": {
                "type": "string"
              },
              "color": {
                "type": "string"
              }
            },
            "required": ["selector"]
          }
        }
      },
      "required": ["measures"]
    },
    "parts": {
      "type": "object",
      "patternProperties": {
        "^[a-z0-9_-]+$": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string"
            },
            "measures": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "content": {
                    "type": "array",
                    "items": {
                      "anyOf": [
                        {
                          "type": "object",
                          "properties": {
                            "type": {
                              "type": "string",
                              "pattern": "^clef$"
                            },
                            "sign": {
                              "type": "string"
                            },
                            "line": {
                              "type": "integer"
                            }
                          },
                          "required": ["type", "sign", "line"]
                        },
                        {
                          "type": "object",
                          "properties": {
                            "type": {
                              "type": "string",
                              "pattern": "^sequence$"
                            },
                            "content": {
                              "type": "array",
                              "items": {
                                "anyOf": [
                                  {
                                    "type": "object",
                                    "properties": {
                                      "type": {
                                        "type": "string",
                                        "pattern": "^event$"
                                      },
                                      "value": {
                                        "type": "string"
                                      },
                                      "notes": {
                                        "type": "array",
                                        "items": {
                                          "type": "object",
                                          "properties": {
                                            "pitch": {
                                              "type": "string"
                                            },
                                            "accidental": {
                                              "type": "string"
                                            }
                                          },
                                          "required": ["pitch"]
                                        }
                                      }
                                    },
                                    "required": ["type", "value"]
                                  }
                                ]
                              }
                            }
                          },
                          "required": ["type", "content"]
                        }
                      ]
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "scores": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "layout": {
            "type": "string"
          },
          "multimeasure-rests": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "start": {
                  "type": "integer"
                },
                "duration": {
                  "type": "integer"
                }
              },
              "required": ["start", "duration"]
            }
          }
        },
        "required": ["name"]
      }
    }
  },
  "required": ["global", "parts"]
}