and writes grouped in this way are gauranteed not to be affected by other writes happening at the same time. Also, all writes are completed at once after the transaction, and if there is an error, no writes happen at all. This goes a long way towards not messing up your data.</p>
<p>A transaction is started using <tt class="docutils literal"><span class="pre"><span class="Identifier">initTransaction</span></span></tt>, and stopped with either <tt class="docutils literal"><span class="pre"><span class="Ident