title: JSON schema validation with arbitrary keys
body: <p>I am using validictory for validating the attached JSON data and schema.
  Working so far.</p>
  
  <p>However the data dictionary can have arbitrary string keys (others than 'bp' but). The key 'bp' in the schema here is hard-coded...it can be a string from a given list (enum of string). How do I add the enum definition here for the "first level" of the dict. </p>
  
  <pre><code>import json
  import validictory
  
  data = {'bp': [{'category': 'bp',
           'created': '2013-03-08T09:14:48.148000',
           'day': '2013-03-11T00:00:00',
           'id': 'dc049c0e-d19a-4e3e-93ea-66438a239712',
           'unit': 'mmHg',
           'value': 147.0,
           'value2': 43.0}]}
  
  
  schema = {
      "type":"object",
      "properties":{
          "bp": {
              "type":"array",
              "required":False,
              "items":
                  {
                      "type":"object",
                      "required":False,
                      "properties":{
                          "category": {
                              "type":"string",
                              "default": "bp",
                              "required":False
                          },
                          "created": {
                              "type":"string",
                              "default": "2013-03-08T09:14:48.148000",
                              "required":False
                          },
                          "day": {
                              "type":"string",
                              "default": "2013-03-11T00:00:00",
                              "required":False
                          },
                          "id": {
                              "type":"string",
                              "default": "dc049c0e-d19a-4e3e-93ea-66438a239712",
                              "required":False
                          },
                          "unit": {
                              "type":"string",
                              "default": "mmHg",
                              "required":False
                          },
                          "value2": {
                              "type":"number",
                              "default":43,
                              "required":False
                          },
                          "value": {
                              "type":"number",
                              "default":147,
                              "required":False
                          }
                      }
                  }
  
  
          }
      }
  }
  
  validictory.validate(data,schema)
  </code></pre>