An HDF5 variable-length String Datatype (Attribute)

{
    "apiVersion": "1.0.0",
    "datasets": {
        "a9217e6b-7bf7-11e4-9645-3c15c2da029e": {
            "attributes": [
                {
                    "name": "A1", 
                    "shape": {
                        "class": "H5S_SIMPLE", 
                        "dims": [4]
                    }, 
                    "type": {
                        "class": "H5T_STRING", 
                        "charSet": "H5T_CSET_ASCII", 
                        "strPad": "H5T_STR_NULLTERM", 
                        "length": "H5T_VARIABLE"
                    }, 
                    "value": ["Parting", "is such", "sweet", "sorrow."]
                }
            ], 
            "shape": {
                "class": "H5S_NULL"
            }, 
            "type": {
                "base": "H5T_STD_I32LE", 
                "class": "H5T_INTEGER"
            }, 
            "value": null
        }
    }, 
    "groups": {
        "a9208b38-7bf7-11e4-b1be-3c15c2da029e": {
            "links": [
                {
                    "collection": "datasets", 
                    "title": "DS1",
                    "id": "a9217e6b-7bf7-11e4-9645-3c15c2da029e",
                    "class": "H5L_TYPE_HARD"
                }
            ]
        }
    }, 
    "root": "a9208b38-7bf7-11e4-b1be-3c15c2da029e"
}