CRUD operations: Create currently deprecated in ODRL

[woutslabbinck]

In this project, I try to create an usage control enforcement engine that is pluggable in an Authorization Server for a Resource Server as defined in the User Managed Access. More specifically, it would plugged into user-managed-access at some point.

To model Usage Control Rules, I am using Open Digital Rights Language (ODRL). For early tests, a focus was put on reading (for which odrl:read was used). When I got into writing, I ran into a problem: https://github.com/woutslabbinck/ucp-enforcement/blob/42b797b0d857b6bfd692e5b013e65448a411086e/rules/data-crud-rules.n3#L12 Basically, I could not find an odrl:Action which encompasses creating something.

• odrl:modify clearly states A new asset is not created by this action, so this one cannot be used
• odrl:append states The act of adding to the end of an asset, indicating that an asset should already exist. Although this comes close, it doesn't matter as it is deprecated
• odrl:use is a generic action. While yes, it includes creating a new asset, it allows for more than that.
• odrl:write stated The act of writing to the Asset and is now deprecated. This one is the closest, but it also does not create a new asset

There are two options right now for the demonstrator usage control engine:

• One of the above odrl:Action is misused and the explicit reason on how they are interpreted are written in the documentation.
• A stub action is used, that will be replaced as soon as there is a way in ODRL to indicate that it is possible to create a new asset.