ISO 20022 or UNIFI is the ISO Standard for Financial Services Messaging. It describes a Metadata Repository containing descriptions of messages and business processes, and a maintenance process for the Repository Content.

The Repository contains a huge amount of financial services metadata that has been shared and standardized across the industry. The metadata is stored in UML

Unified Modeling Language

Unified Modeling Language is a standardized general-purpose modeling language in the field of object-oriented software engineering. The standard is managed, and was created, by the Object Management Group...

 models with a special 20022 UML Profile.