Hi Diogo,
Just to add to your question ...
On 6/6/2011 7:40 AM, Diogo FC Patrao wrote:
Hello
I'm working on a mapping in which a instance receives many class
types, depending on some database values.
I have a table "Patients", which lists all patients I have. I
d2r:classMap them to 0.0.0.0:Patient. Instances have URI
"0.0.0.0/Patient/@@patient_id@@ <http://0.0.0.0/Patient/@@patient_id@@>"
Then I have a table "Answers", which represents answers to some
questions presented in forms. Let's say I have three fields in this
table (patient_id, question_id, answer), and if a condition is
fulfilled (question_id=148 and answer like 'C50%'), it means that the
respective patient belongs to class BreastCancer. Of course, each
Patient instance will belong to many classes.
I have a very similar use-case. I am trying to map an endoscopy database
where the main entity is a "finding", which is something that is noticed
during an endoscopy procedure. However, the forms that describe findings
(more than one form per finding) have many questions and answers that
could help classify the finding in different ways. However, if I
understood your use-case correctly, I don't want to infer many types, I
want to infer the single most correct/specific type for each finding
based on the values entered in the various forms. More sophisticated
classification can then be done with an OWL reasoner after the
appropriate individuals and types are retrieved.
In my case, the form values that I might use are normalized into other
tables. There is a table for all the check-box values, a table for the
radio button values, a table to the drop-down values, etc., indexed by
finding_id and form_id. If my classification depends on more than one
of these form values (from two different tables), what is the best way
to do this? I see that a PropertyBridge can have a join specification
but a ClassMap can not. I think it would be easier to specify a "type"
condition by using a PropertyBridge because the "join" specification
could simplify writing the "where" condition. Either way, the mapping
appears to be complicated but maybe a little simpler with PropertyBridge
and "join". Otherwise, the "where" condition in the ClassMap with have
to have a full SELECT/JOIN and see if the resultset is not empty.
Thank,
Shahim
I was trying to map this on d2r and found two possible solutions:
1) create a ClassMap for each condition, or
2) create a PropertyBridge for each condition, using the property
rdf:type.
I can't tell which one is better, considering query performance and
"semantic correctness" (like, am I using correctly PropertyBridge?).
But I've problems in the past trying to making several ClassMaps to
one class.
Thanks in advance!
--
diogo patrão
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