First, let me agree this is not about programming. This is more about Financial Industry Architecture, and OpenStandards. It requires some exposure to banking (and financial) industry.
When I was preparing for TOGAF exam, I came across Open Standard available for DataModel, Service Model, Architecture for many industries.
(Example: ARTS has defined a data model for the Retail industry. Energistics has defined a data model for the Petrotechnical industry. FPL Defined fix protocol for trading. SWIFT & ISO has some standard about Interbank Messaging.)
I would like to know from this community What are all the OpenStandard - "protocol, datamodel, servicemodel" which you work with in Financial Industry? How many of them are really "Open" and widely used