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-.\" This is -*-nroff-*-
-.\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/doc/man/Attic/create_version.l,v 1.1.1.1 1996/08/18 22:14:22 scrappy Exp $
-.TH "CREATE VERSION" SQL 01/23/93 Postgres95 Postgres95
-.SH NAME
-create version \(em construct a version class 
-.SH SYNOPSIS
-.nf
-\fBcreate version\fP classname1 \fBfrom\fP classname2 [\fB[\fPabstime\fB]\fP]
-.fi
-.SH DESCRIPTION
-.IR "Currently, the versioning facility is not working."
-.PP
-This command creates a version class
-.IR classname1
-which is related
-to its parent class,
-.IR classname2 .
-Initially,
-.IR classname1
-has the same contents as
-.IR classname2.
-As updates to 
-.IR classname1 
-occur, however,
-the content of
-.IR classname1
-diverges from
-.IR classname2.
-On the other hand, any updates to
-.IR classname2
-show transparently through to
-.IR classname1 ,
-unless the instance in question has already been updated in
-.IR classname1 .  
-.PP
-If the optional
-.IR abstime
-clause is specified, then the version is constructed relative to a
-.BR snapshot
-of
-.IR classname2
-as of the time specified.
-.PP
-Postgres uses the query rewrite rule system to ensure that 
-.IR classname1
-is differentially encoded relative to
-.IR classname2.  
-Moreover, 
-.IR classname1
-is automatically constructed to have the same indexes as
-.IR classname2 .
-It is legal to cascade versions arbitrarily, so a tree of versions can
-ultimately result.  The algorithms that control versions are explained
-in [ONG90].
-.SH EXAMPLE
-.nf
---
---create a version foobar from a snapshot of
---barfoo as of January 17, 1990
---
-create version foobar from barfoo [ "Jan 17 1990" ]
-.fi
-.SH "SEE ALSO"
-create view(l), merge(l). 
-.SH "BUGS"
-Snapshots (i.e., the optional 
-.IR abstime 
-clause) are not implemented in Postgres.