Mubert Playlist

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/mubert/refs/heads/main/json-schema/mubert-playlist-schema.json",
  "title": "Mubert Playlist",
  "description": "Playlist node in Mubert's mood/genre/activity taxonomy. Each playlist exposes an index used to drive generation and streaming, plus the BPM/key envelopes it supports.",
  "type": "object",
  "required": ["playlist_index"],
  "properties": {
    "playlist_index": {
      "type": "string",
      "pattern": "^\\d+(\\.\\d+)*$",
      "description": "Dotted index addressing the playlist in the Mubert taxonomy tree (e.g. '1.0.0')."
    },
    "category": { "type": "string", "description": "Top-level category (e.g. Activity, Genre, Mood)." },
    "group":    { "type": "string", "description": "Sub-grouping inside the category (e.g. Workout, Lo-fi, Chill)." },
    "channel":  { "type": "string", "description": "Leaf channel name presented to end users." },
    "params": {
      "type": "array",
      "description": "Allowed BPM ranges and the keys playable in each range.",
      "items": {
        "type": "object",
        "properties": {
          "bpm": {
            "type": "object",
            "properties": {
              "gt": { "type": "integer", "description": "Lower bound (exclusive)." },
              "lt": { "type": "integer", "description": "Upper bound (exclusive)." }
            }
          },
          "keys": {
            "type": "array",
            "items": { "type": "string", "description": "Musical key/scale identifier." }
          }
        }
      }
    }
  }
}