Re: Chen-ERD and Crow's Foot Diagrams?
- From: Andrew S Halper <ashalper acm org>
- To: dia-list gnome org
- Subject: Re: Chen-ERD and Crow's Foot Diagrams?
- Date: Sat, 6 Apr 2002 11:37:41 -0500
On 2002.04.06 02:47 Cyrille Chepelov wrote:
Le Sat, Apr 06, 2002, à 08:18:10AM +0200, Daryl Manning a écrit:
> Just seemed like a fast easy way to support Crow's Feet and it is
> they happen to do in Visio anyway?
I'm lost. What are crow's feet diagrams ? Can you give me a pointer ?
Information Engineering (a.k.a.: Crow's Feet, IE, Information
Engineering Methodology, IEM) and IDEF (especially IDEF1X) are common
standards for ER diagrams. I think Visio supports IE (I've never used
Visio), ERwin supports IE and IDEF1X (and possibly UML in later
versions I think). ER/Studio supports IDEF1X and possibly others.
An example of IE is on page 12 of this rather large PDF file:
An example of IDEF1X is on pages 26-28 of this PDF file:
In fact this is the entire IDEF1X standard.
Although they have varying degrees of expressiveness, traditional ER
(like Dia uses), Chen, IE, IDEF1X, and UML-as-ER (like I used in the
SQL plug-in), are just different notations for representing the same
underlying ER model, which is why I suggested they be unified under
another application. It could be done by Dia, but it would involve
some radical surgery of the ER and UML code, and I don't know if it's
worth the risk of dinging up these two imporant features.
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