Hi all,

I have several questions about how to use the new transaction features
provided with the last version of TDB:

* Do we have to use the commit operation with a read transaction? Is
it compulsory (e.g. to release a lock), optional, or an error?

* It seems that operations on DatasetGraphTxn do not throw checked
exceptions. However, do these operations can throw an unchecked
exception?

* Does nested read transactions are allowed?

*  When a StoreConnection is created with Location.mem() as location,
what is created in memory (dataset+journal, only dataset or only
journal)?

* Does the information on the following webpages are up to date?
  - http://openjena.org/wiki/TDB/Transactions
  - https://cwiki.apache.org/confluence/display/JENA/TxTDB-design

Kind Regards,
Laurent

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