title: MDDL
text: # MDDL
  
  MDDL (Market Data Definition Language) is an XML-based messaging format for exchanging information related to
  
  * Financial Instruments
  * Corporate events related to the financial instruments
  * Market-related data
  
  MDDL was developed by FISD (Financial Information Services Division) of SIIA (Software & Information Industry Association). The initiative for the use of XML in market data exchange was started in 2000 and has been gaining industry-wide acceptance.
  
  