Replacement for Oracle Workspace Manager

Hi,

Oracle has a product called Oracle Workspace Manager:

http://www.oracle.com/technetwork/database/enterprise-edition/index-087067.html

Website says:

"Workspace Manager, a feature of Oracle Database, enables application
developers and DBAs to manage current, proposed and historical versions
of data in the same database.

Applications and DBA operations often work with more than one version of
the data. Three common reasons to have multiple data versions are
concurrency, auditing and scenario creation. Oracle Workspace Manager
provides workspaces as a virtual environment to isolate a collection of
changes to production data, keep a history of changes to data and create
multiple data scenarios for “what if” analysis. It can save money, time
and labor over traditional approaches."

Does anyone know any approach to replace this product with something in
PostgreSQL world?

Regards,
--
Devrim GÜNDÜZ
Principal Systems Engineer @ EnterpriseDB: http://www.enterprisedb.com
PostgreSQL Danışmanı/Consultant, Red Hat Certified Engineer
Community: devrim~PostgreSQL.org, devrim.gunduz~linux.org.tr
http://www.gunduz.org Twitter: http://twitter.com/devrimgunduz