1) I would like to extract details for a set of vessels based on some criteria, saw dwt, year of build, sub type etc. The fields that I need can be defined as a list to be passed as params to get_data. However for instruments I am constrained since I need to predefine the list and cannot query it. Is there any way it can be done? Would be useful for instruments where RICs may not be known but values for some of the fields might be known.
2) Would it be possible to categorize vessels by certain attributes like an index in equities. This should help query all constituents of the index. For eg if a list of all oil tankers are created or a list of all VLCCs. Then it would easier to just feed in the index instrument.