Step 4: Create the BDL session initiator function and instantiate a new session

In your BDL function declared as session initiator, you must:

Handle the creation of the session.
Fill the state variable before to return from the function.
Store the state variable in a database based on the state variable (in order to keep the session across consecutive requests from a same client).

For example:

FUNCTION GetInstance()
  # Generate an unique string (can come from a database table id)
  LET ServiceState = com.Util.CreateUUIDString()
      ... Store ServiceState value into database or use directly a 
          database table entry to hold the session
END FUNCTION