JSON Siren vs. HAL Representations

hal.json

{
  "_links": {
    "self": { "href": "/orders" },
    "next": { "href": "/orders?page=2" },
    "find": { "href": "/orders{?id}", "templated": true }
  },
  "_embedded": {
    "orders": [{
        "_links": {
          "self": { "href": "/orders/123" },
          "basket": { "href": "/baskets/98712" },
          "customer": { "href": "/customers/7809" }
        },
        "total": 30.00,
        "currency": "USD",
        "status": "shipped",
      },{
        "_links": {
          "self": { "href": "/orders/124" },
          "basket": { "href": "/baskets/97213" },
          "customer": { "href": "/customers/12369" }
        },
        "total": 20.00,
        "currency": "USD",
        "status": "processing"
    }]
  },
  "currentlyProcessing": 14,
  "shippedToday": 20
}

siren.json

{
  "class": "orders",
  "properties": {
    "currentlyProcessing": 14,
    "shippedToday": 20
  },
  "entities": [
    {
      "class": "order list-item",
      "rel": "order",
      "properties": {
        "total": 30.00,
        "currency": "USD",
        "status": "shipped"
      },
      "entities": [
        { "rel": "basket", "href": "/baskets/98712" },
        { "rel": "customer", "href": "/customers/7809" }
      ],
      "links": [{ "rel": "self", "href": "/orders/123" }]
    },
    {
      "class": "order list-item",
      "rel": "order",
      "properties": {
        "total": 20.00,
        "currency": "USD",
        "status": "processing"
      },
      "entities": [
        { "rel": "basket", "href": "/baskets/98713" },
        { "rel": "customer", "href": "/customers/12369" }
      ],
      "links": [{ "rel": "self", "href": "/orders/124" }]
    }
  ],
  "actions": [{
      "class": "find-order",
      "href": "/orders",
      "fields": [{ "name": "id", "type": "number" }]
  }],
  "links": [
    { "rel": "self", "href": "/orders" },
    { "rel": "next", "href": "/orders?page=2" }
  ]
}

Anyone know which json standard has become most popular? I'm writing a bunch of json schema for various multimedia apps but standardization among units is lacking. Will probably go with something closer to Siren.

You may find this useful and/or interesting: http://json-schema.org/latest/json-schema-core.html