The PMIP Database release tags
The PMIP database is now stored in a CVS repository. This makes it
possible to define release tags that allow the database administrator
and the other users to easily access the latest release of the variables as
well as older releases!
The three different kinds of release tags are described below. All
the tags of a given type are given in a strictly increasing order,
which makes it easy to determine if a release of a variable with a
given tag is older or more recent than a release with another
tag. Note that the same release of a variable can be assigned
different tags, if the variable doesn't change between major updates
of the database!
- Major release tags : these tags are used to freeze all the
files in the database at a given time (or take a picture of the
database), when the database is supposed to be in a stable enough
state. The files can be retrieved later in this state (even if they
have been modified) by accessing the PMIP CVS repository with the
apropriate tag. You can make a reference to the major release tag of
the PMIP database you have used in your articles. If you have worked with
files that were updated since a major release but are not part (yet)
of the next major release, you can specify the major release tag and
the date of the last time you updated the variables you used.
There are two kinds of major release tags that point to the same
files. One is just a numeric release number, whereas the other is more
human readable and intuitive :
- Rnumber : R0, R1, ...
- PMIPyear_letter : PMIP2001a, PMIP2001b, ...
The R0 and PMIP2001a tags, for example, were given
to the first release of the database that was checked in the CVS
repository in January 2001.
- Update release tags : these tags are used when
the database is updated between two major releases. They are usually
used when several files are changed at the same time (e.g. when the
new release of a model is added to the database or when a bunch of
similar files are processed/corrected). It is likely that single files
are updated in the database without being assigned a specific release
tag. In that case, the files have only newer revision numbers, but no
tags are associated with these revisions.
An update release tag has the following form :
Rmonth-year_letter (e.g. R03-2001a,
- Special current release tag :
contrary to the other tags, the current tag is not always
associated with the same revision of a file in the database! For each
variable in the database, this tag is associated with the latest
hopefully correct revision of the variable. A variable may have no
(revision associated with the) current tag, which means that
it has not been tested yet or that it has been tested and was not
correct... Please check the Database
News page for more details.
The anonymous ftp web site holds only the revisions of the files
(README files and variables) that have the current tag. You
have to use the CVS server if you want to access all the files.
You can find the actual tags used in the PMIP database on the tags history page.
||Last updated 2001/10/09 15:48:39|