I think Robert's text needs a bit more background. Would someone try?
Multiple instantiation is fundamental to the CRM and semantic models.
Not just a technique.
We also observe that programmers writing code for selecting applicable
properties as data entry into RDF/OWL based systems or mapping systems
use to forget multiple instantiation, and to alert users that a suitable
subclass may have the property needed.
It's not only a problem with other kinds of data models.
Best,
Martin
On 12/11/2018 1:42 PM, Christian-Emil Smith Ore wrote:
I like Robert's text. I can see some problems with the use of "merged classes" since
there is a large number of possible classes. A "merged" class is simply a way to
reformulate same as at the class level.
In a relational datebase one would need a common series of identifier for the
primary key in all involved tables which is uncommon but ok since one in
principle need only one sequence giving unque identifers for an entire database
(or all databases in the world)
Best
Christian-Emil
________________________________________
From: Crm-sig<[email protected]> on behalf of Detlev
Balzer<[email protected]>
Sent: 11 December 2018 12:16
To:[email protected]
Subject: Re: [Crm-sig] Using multiple instantiation
I'm also wondering if we actually need such explanation. If the concern is that
many implementations at their core are not natively RDF or even graph-based and
would run into difficulties trying to create relationship representations or
classes in an object oriented programming language that instantiated multiple
ontological classes.
then this is certainly true for "classical" relational databases without any
level of object-relational mapping. However, anyone embarking on a certain degree of
object-oriented design will be (or soon become) aware of these limitations, and of the
various solutions discussed at length in the developer community.
Detlev
Am 11.12.2018 um 11:23 schrieb Richard Light:
Hi,
Unless I have misunderstood, both versions came from Robert. I still think that
we need to consider what actually needs to be in the RDF document. In my view
it should be the absolute minimum to 'do the job': the only question is what
'the job' should be.:-)
Richard
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