Dear Simon,
Our messages crossed, your analysis is correct! We have discussed
however, that reification or annotation is not recommended, rather an
introduction of a node (class) representing a triary property rather than
an individual entity. From the existence of an instance of
PC14_carried_out_by we can automatically infer
the instance of P14, as described in the formalization.
All the best,
martin
On 3/2/2016 7:55 μμ, Simon Spero wrote:
The first order formalization given in the crm document are:
P14(x,y,z) ⊃ [P14(x,y) ∧ E55(z)]
Note that the predicate on the left hand side has three arguments,
which is more arguments than rdf is comfortable with.
The "in the role of" property is modifying an instance of a "carried
out by" property.
An activity can be carried out by several different agents, each in a
different role, so the property cannot be attached directly to the
activity.
There are several possible ways of representing this using semantic
web tools.
The first approach is to use RDF reification. I am not going to say
anything more about this.
If you are using OWL 2, you can add an annotation each "carried out
by" property assertion. This is not ideal, as annotations are not
really supposed to be part of the data in the model, and most
reasoners ignore them. They are also not easy to work with in RDF.
A third approach is to define your own class for reification,
representing an instance of a "carrying out" ; this class would have
properties relating the activity, the agent, and the role.
The best approach may be to define a sub property of P14 for each type
of carrying out in a role which is relevant to your model.
You can specify the role associated with all uses of this property
using a property whose subject is the subproperty.
Simon
On Feb 3, 2016 10:01 AM, "Allison Miller"
<[email protected] <mailto:[email protected]>>
wrote:
Hello,
I wish to use the CIDOC CRM but need a formal model to do so and
have a question concerning .1 properties.
eg. E7 Activity has: P14 carried out by (performed): E39 Actor and
(P14.1 in the role of: E55 Type)
It is a property I need to use - but I can’t work out how to model it!
I thought I could use the Erlangen OWL implementation, but I can’t
find these properties in it. (That’s not to claim they aren’t
there, my knowledge of OWL is limited.)
I would welcome any guidance on P14.1, and other .1 properties, in
the Erlangen implementation, or advice on including them in a
definition compatible with Semantic Web technologies if anyone has
done this.
Kind regards,
Alli
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