title: What does it mean that Azure Cosmos DB is multi-model?
body: <p>Looking at the new Azure cosmos database, I'm a bit confused about the multi-model nature of it.  Specifically, does it mean:</p>
  
  <p>a) That the same underlying database/store can be queried multiple ways concurrently so that I can use both gremlin graph queries and mongodb api against the same collections.</p>
  
  <ul>
  <li>or - </li>
  </ul>
  
  <p>b) Does it mean that you can choose a different model (graph, key value, column, document) at the time of provisioning your Cosmos DB and that is how the data will be stored from then on.  </p>
  
  <p>The brochure makes it sound like a), but using the Azure dashboard to create a cosmos instance it makes it seem like b) since you have to choose a model type at creation. </p>
  
  <p>Additionally, the literature makes reference to columnar data, but I don't see the option for it at create time.</p>