Stock instruments are identified by the field types and values within the field.
If the Product field of the Instrument block is present and has the value 5 (EQUITY), then the instrument is a stock.
If Product is not present but Security Type is present and has the value CS or PS (Common Stock or Preferred Stock), then the instrument is a stock.
If both Product and Security Type are not present and the CFICode field is present and the first character of the field is E (for Equity) and the second letter is one of S, P, R, C, F, or V, then the instrument is a stock.
Otherwise, this is not a stock.
RAP - The Trading Edition does not support multi-leg securities.
See CFI Code values at http://www.iso.org/iso/catalogue_detail?csnumber=32835 for full documentation.