An HDF5 variable-length Datatype (Dataset)

{
    "apiVersion": "1.0.0",
    "datasets": {
        "89dfb414-7b83-11e4-8384-3c15c2da029e": {
            "shape": {
                "class": "H5S_SIMPLE", 
                "dims": [2], 
                "maxdims": [2]
            }, 
            "type": {
                "base": {
                    "base": "H5T_STD_I32LE", 
                    "class": "H5T_INTEGER"
                }, 
                "class": "H5T_VLEN"
            }, 
            "value": [
                [3, 2, 1], 
                [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144]
            ]
        }
    }, 
    "groups": {
        "89de7ee6-7b83-11e4-b0e9-3c15c2da029e": {
            "links": [
                {
		    "class": "H5L_TYPE_HARD",
                    "title": "DS1",
		    "collection": "datasets",
                    "id": "89dfb414-7b83-11e4-8384-3c15c2da029e"
                 }
            ]
        }
    }, 
    "root": "89de7ee6-7b83-11e4-b0e9-3c15c2da029e"
}