[ckan-discuss] [ww at styx.org: Re: package relationships]

[William Waites]

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----- Forwarded message from William Waites <ww at styx.org> -----

Date: Thu, 17 Feb 2011 10:04:55 +0100
From: William Waites <ww at styx.org>
Subject: Re: [ckan-discuss] package relationships
To: David Raznick <kindly at gmail.com>
Cc: rufus.pollock at okfn.org, ckan-discuss at lists.okfn.org
Message-ID: <20110217090455.GA11303 at styx.org>
User-Agent: Mutt/1.4.2.3i

* [2011-02-16 23:55:08 +0000] David Raznick <kindly at gmail.com> écrit:

] Nonetheless, I personally agree that package relationships better suit
] *linked datasets*.  I do not think however that package relationships suit
] *derived datasets* better than the resource group proposal.  Currently the
] derived relationship type is not being used in ckan.net at all.

A "link" in this sense is a type of relationship. Derivation
is another type of relationship. Derivation alone is not enough
because you almost always want to say how and by whom it is 
derived. So you end up with something like,

+-----------------+ wasGeneratedBy   +---------+
| Derived Dataset | ---------------- | Process |
+-----------------+                  +---------+
                                      //  |
   +------------------+     used     //   | controlledBy
   | Source Dataset 1 |------------- /    |
   +------------------+             / +--------+
                                   /  | User / |
           ....                   /   | Person |
                                 /    +--------+
   +------------------+  used   /
   | Source Dataset 1 |--------/
   +------------------+

This is more or less the shape of what you are trying to moedl
(using ideas from the Open Provenance Model). Tis is why 
neither package extras nor the packages groups will do 
a very good job.

-w

-- 
William Waites                <mailto:ww at styx.org>
http://river.styx.org/ww/        <sip:ww at styx.org>
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-- 
William Waites                <mailto:ww at styx.org>
http://river.styx.org/ww/        <sip:ww at styx.org>
F4B3 39BF E775 CF42 0BAB  3DF0 BE40 A6DF B06F FD45