title: ODATA $expand and $select queries in url
body: <p>Yes, I know, this question is always asked. But I looked for answers to my problem, and everything I've seen is the same explanation, but it still doesn't work for me. Explanations.</p>
  
  <p>For example on the Northwind service (that I use to train because it is simple, before using my job's service) : <a href="https://services.odata.org/V2/Northwind/Northwind.svc/" rel="nofollow">https://services.odata.org/V2/Northwind/Northwind.svc/</a></p>
  
  <p>If I do </p>
  
  <ul>
  <li><a href="https://services.odata.org/V2/Northwind/Northwind.svc/Categories" rel="nofollow">https://services.odata.org/V2/Northwind/Northwind.svc/Categories</a></li>
  <li><a href="https://services.odata.org/V2/Northwind/Northwind.svc/Categories" rel="nofollow">https://services.odata.org/V2/Northwind/Northwind.svc/Categories</a>?$select=CategoryName</li>
  <li><a href="https://services.odata.org/V2/Northwind/Northwind.svc/Categories" rel="nofollow">https://services.odata.org/V2/Northwind/Northwind.svc/Categories</a>?$expand=Products</li>
  </ul>
  
  <p>It works.</p>
  
  <p><strong>BUT</strong> if I want to do : <a href="https://services.odata.org/V2/Northwind/Northwind.svc/Categories" rel="nofollow">https://services.odata.org/V2/Northwind/Northwind.svc/Categories</a>?$expand=Products($select=ProductName) (since there is a ProductName property in Products) ... It doesn't work. I have the error : <strong>Syntax error at position 9</strong>. That "position 9" corresponds to the first parenthesis.</p>
  
  <p>However, all I have seen on <a href="http://odata.org/documentation" rel="nofollow">http://odata.org/documentation</a> and on StackOverflow's forum says it should be something like that. What do I wrong ?</p>