[Zope] Concurrency control

[Nils Kassube]

Guten Abend.

According to the Zope Developer's Guide our favourite web application
server prevents dirty reads with his transaction support. Is it possible
to prevent non-repeatable reads and phantom reads, too? Or should I use
a more appropriate tool like PostgreSQL with support for MVCC? Is there
more documentation about Zope's transaction support? (Or is it another
case for "Read the source, Luke"?) 

Cheers,
Nils