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Re: Primer OWL Entailment

From: Chimezie Ogbuji <ogbujic@bio.ri.ccf.org>
Date: Tue, 20 Mar 2007 15:11:35 -0400 (EDT)
To: Harry Halpin <hhalpin@ibiblio.org>
cc: public-grddl-wg <public-grddl-wg@w3.org>
Message-ID: <Pine.GSO.4.60.0703201423440.28017@joplin.bio.ri.ccf.org>

On Tue, 20 Mar 2007, Harry Halpin wrote:
> Chime,
>    If you can, remind me of one simple OWL entailment that would make
> sense with the clinical data example in the GRDDL Primer and I'll add
> the verbal description and check it into the primer...

Hello Harry.  See #swig comment http://chatlogs.planetrdf.com/swig/2007-03-20.html#T16-09-11

<chimezie> HarryH: in retrospect, there is really nothing about the RDF exracted from HL7 that would be of any use for inference

Below is a somewhat contrived example, but the problem 
primarily is that HL7 RIM is an information model not a knowledge 
representation [1] & [2] So, there is a ceiling on the amount of useful 
inference you can derive from data extracted from HL7 *by itself*.

You could introduce a subclass of foaf:Image for images which depict 
(foaf:depicts [3]) a cpr:medical-sign [4]:


@prefix ex: <tag:cogbuji@ccf.org,2007-03-20:ImagingSemantics#>.
@prefix cpr: <http://purl.org/cpr/0.5#>.
@prefix foaf: <http://xmlns.com/foaf/0.1/>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.

ex:DiagnosingImage a owl:Class;
                    rdfs:subClassOf foaf:Image,
                    [ a owl:Restriction;
                      owl:onProperty ex:indicates;
                      owl:someValuesFrom cpr:medical-sign ]

ex:indicates a owl:ObjectProperty;
              rdfs:comment "Property relating a foaf:Image to a medical sign it indicates";
              rdfs:subPropertyOf [ owl:inverseOf cpr:interpretant-of ];
              rdfs:domain foaf:Image;
              rdfs:range cpr:medical-sign


So, if you associated the example cpr RDF graph with the 
above OWL fragment and the POMR ontology (there is still no 
consistent precedent on how to do such a thing: associate the ABOX with 
*a* TBOX in OWL), and followed OWL entailment, you could dispatch the following SPARQL query:

PREFIX cpr: <http://purl.org/cpr/0.5#>
PREFIX ex: <tag:cogbuji@ccf.org,2007-03-20:ImagingSemantics#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT ?sign ?image
FROM <http://lists.w3.org/Archives/Public/public-grddl-wg/2007Feb/att-0199/hl7-sample.xml>
   ?image a ex:DiagnosingImage;
          ex:indicates [ skos:prefLabel ?sign ]

This ofcourse, assumes the piece of code responsible for processing this 
bit of SPARQL:

- Is a GRDDL-aware agent (note the GRAPH URL is the source document)
- Can follow its nose (by some yet unknown convention) to find the OWL assertions
- Is capable of performing OWL (DL? Full?) inference *before* dispatching a SPARQL query over an RDF graph

The result:

image  |   sign
_:foo  |  "Chest hyperinflated"

The URI for the image is a BNode in this case.  Not so useful, but 
consider (perhaps) if the medical record instead used a resolvable HTTP 
URI of the actual Chest Xray, or an authoritative identifier from an imaging repository within the 
institution where the Xray was performed.

Hope this suites your needs.

[1] http://ontology.buffalo.edu/HL7/doublestandards.pdf
[2] http://esw.w3.org/topic/HCLS/ISWC/Workshop?action=AttachFile&do=get&target=CPR-KR.html#(5)
[3] http://xmlns.com/foaf/0.1/#term_depicts
[4] http://metacognition.info/ontologies/pomr-full.html#medical-sign

Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
Received on Tuesday, 20 March 2007 19:12:50 UTC

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