On 2019-10-16 7:33 AM, Frank Millman wrote:
Here is a link to an article entitled 'Understanding Hidden Subtypes'.
It dates back to 2004, but I think it is still relevant. It addresses
precisely the issues that you raise, but from a data-modelling
perspective, not a programming one.
http://tdan.com/understanding-hidden-subtypes/5193
I found it invaluable, and applied the concepts in my own
business/accounting application. Having created the ability to make
subtypes visible and explicit, I found all kinds of unexpected uses for
them.
The article seems to be missing a couple of images (Figure 1 and Figure
2) showing the data relationships. I downloaded the original article
onto my computer years ago, and my local copy does have the images, so
if you would like to see them let me know and I will upload my version
somewhere to make it accessible.
I received a couple of requests for a link to the original article, so I
uploaded it to filebin. Here is the link -
https://filebin.net/1ia5kcq2sbp57t1o
The file will be deleted automatically in one week. I don't know if that
is good netiquette. Should I use a site where it never expires? Google
Drive? Recommendations welcome.
Frank
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