This issues shows up with the following REST API methods. It is also present for the new HASSTMT REST API method.
The correct semantics for the openrdf API are as follows (and are documented at BD.NULL_GRAPH in our code base).
Note: This problem showed up when trying to integrate HASSTMT into our RemoteRepository.
TODO Revisit the ESTCARD and DELETE_BY_ACCESS path APIs on the client and the server and ensure test coverage for compliance. Also add test coverage for HASSTMT.
TODO Document the interpretation of &c more completely on the NSS wiki page per this ticket.
BLZG-1143 Extension REST API does not support multiple context values