model-schema.json

{
    "$schema": "http://json-schema.org/draft-07/schema",
    "type": "object",
    "properties": {
        "textures": {
            "type": "object",
            "patternProperties": {
                "(\\w+)": {
                    "$ref": "#/definitions/texture"
                }
            }
        },
        "elements": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "rotations": {
                        "type": "object",
                        "properties": {
                            "x": { "$ref": "#/definitions/rotation" },
                            "y": { "$ref": "#/definitions/rotation" },
                            "z": { "$ref": "#/definitions/rotation" }
                        }
                    },
                    "from": {
                        "$ref": "#/definitions/array_vector3"
                    },
                    "to": {
                        "$ref": "#/definitions/array_vector3"
                    },
                    "faces": {
                        "type": "object",
                        "properties": {
                            "north": {
                                "$ref": "#/definitions/face"
                            },
                            "south": {
                                "$ref": "#/definitions/face"
                            },
                            "east": {
                                "$ref": "#/definitions/face"
                            },
                            "west": {
                                "$ref": "#/definitions/face"
                            },
                            "down": {
                                "$ref": "#/definitions/face"
                            },
                            "up": {
                                "$ref": "#/definitions/face"
                            }
                        }
                    }
                }
            }
        }
    },
    "definitions": {
        "rotation": {
            "enum": [-45, -22.5, 0, 22.5, 45]
        },
        "array_vector3": {
            "type": "array",
            "items": {
                "type": "number"
            },
            "maxItems": 3,
            "minItems": 3
        },
        "array_vector4": {
            "type": "array",
            "items": {
                "type": "number"
            },
            "maxItems": 4,
            "minItems": 4
        },
        "face": {
            "type": "object",
            "properties": {
                "uv": {
                    "$ref": "#/definitions/array_vector4"
                },
                "uvRotation": {
                    "$ref": "#/definitions/rotation"
                },
                "texture": {
                    "oneOf": [
                        {
                            "$ref": "#/definitions/texture"
                        },
                        {
                            "type": "string",
                            "pattern": "(#\\w+)"
                        }
                    ]
                }
            }
        },
        "texture": {
            "type": "string",
            "pattern": "(\\w+\\:)?\\w+\\/\\w+"
        }
    }
}