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Instantiating sub-class from super

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.
> 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 -

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.