Current status of 2-phase commit support?

["OneTwo Soft" <one2soft(at)hotmail(dot)com>]

Hi all,

Found some really confusing news on PostgreSQL supporting the 2-phase commit 
protocol or not, so I thought it might be a good idea to ask the question 
straight to the base: is 2-phase commit supported by Postgres, using JDBC to 
access the database? And what about the issue "Postgres claims to support XA 
but is really emulating it"?

Many thanks for your help.

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