Use cases that may involve a transaction

Add a LDP-RS

Add a named graph with some triples
Add metadata about the graph

Update an LDP-RS

Query current resource (named graph)
Apply SPARQL-UPDATE to in-memory graph
Add new named graph with new dataset
Modify (insert and delete triples) metadata in main graph

(Soft-)Delete a resource

Mark resource as deleted in the main graph (set type to tombstone)