title: Bloomberg Security Lookup - Best way to lookup by symbol and exchange/country
body: <p>What is the best way to lookup symbols based upon country or exchange? Example if I want to query for the March 2016 Ten Year Treasury Note I pass in 'TYH6 Comdty'. What if I want to designate the country or exchange in the query? Is that possible?</p>
  
  <p>I'm trying to match position records from our clearing firm to calculate P&amp;L with data from the Bloomberg API. I'm not sure if it's going to be a viable solution based upon clearing symbols and matching them to Bloomberg symbols for derivatives. I can match on Maturity(YYYYMM) but I'm not sure the product code will match up.</p>
  
  <pre><code>Request request = refDataService.CreateRequest("ReferenceDataRequest");
  Element securities = request.GetElement("securities");
  securities.AppendValue("TYH6 Comdty");
  </code></pre>
  
  <p>If I want to be able to filter the request by exchange or country, is that possible?</p>