title: Firebase rest API filter query
body: <p>my data look like </p>
  
  <pre><code>{
    "word0" : {
      "level" : "B2",
      "meaning" : [ "Meaning19", "meaning43" ],
      "type" : "Noun",
      "weight" : 0,
      "word" : "word99"
    },
    "word1" : {
      "level" : "C1",
      "meaning" : [ "Meaning19", "meaning43" ],
      "type" : "Noun",
      "weight" : 0,
      "word" : "word99"
    },
    "word10" : {
      "level" : "A2",
      "meaning" : [ "Meaning19", "meaning43" ],
      "type" : "Noun",
      "weight" : 0,
      "word" : "word99"
    }
  }
  </code></pre>
  
  <p>i am using curl get request <code>https://words-b6651.firebaseio.com/DE-EN.json?orderBy="$key"&amp;print=pretty</code> and i want to get all words of a given level </p>
  
  <p>is it possible to do something like $key."level" as in MongoDB ? and how could i get these data</p>