Github user afs commented on the issue:
https://github.com/apache/jena/pull/161
Eventually, a ``begin()`` would start a transaction in a way that is
promotable. This fits the expectation of JDBC (it's even implicit there) and
help bring the existing graph-level `TransactionHandler` into line (an existing
API so the barrier to change is higher, albeit an API that isn't likely to be
used much as it does not automatically fit with dataset transactions).
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