Re: [ontology-summit] Ontology driven Data Integration using owl:equival

[Kingsley Idehen <kidehen@xxxxxxxxxxxxxx>]

On 2/7/14 1:16 PM, Andrea Westerinen wrote:

Kingsley, +1 ... Your mapping/bridge/meta ontology is my "integrating ontology".  And, you captured the essence extremely well in your demos.

The keys are: 

1.  Creating the mappings

2.  Reasoning with the mappings

Clearly this works over data that is Linked Data or data in ontologies.

Yes! The data in the ontologies can also be constructed using Linked Open Data principles.

I've tried to get this point across for many years, with limited success. Of course, some of this had a lot to do with making the point to the wrong audience. Over here, the subject matter is generally understood the the list membership, which makes republishing live demos a lot more productive etc..

The more we demonstrate what's possible the clearer these matters will become. In my eyes, lack of live demos -- when the subject matter is a World Wide Web that's now enhanced with blogic [1] -- remains the biggest hurdle of all (modulo decoupling RDF and RDF/XML!).

-- 

Andrea Westerinen

T: 425.891.8407

arwesterinen@xxxxxxxxx or andreaw@xxxxxxxxxxx

http://ontolog.cim3.net/cgi-bin/wiki.pl?AndreaWesterinen

organizingknowledge.blogspot.com

Kingsley

On Fri, Feb 7, 2014 at 10:01 AM, Kingsley Idehen <kidehen@xxxxxxxxxxxxxx> wrote:

All,

Starting a new thread based on the theme above to make what I am trying to demonstrate clearer.

Situation:

Schema.org [1] is a collaborative effort aimed as simplifying structured data publication to the Web. As part of this effort, a number of collaborators have collectively produced a number of shared vocabularies under the "schema.org" namespace.

In addition to what's being produced by Schema.org there are a thousands of shared ontologies and vocabularies that have been constructed and published to the Web from a plethora of sources, many of these have been aggregated by services such as LOV (Linked Open Vocabulary) [2] which is basically accentuates the TBox and RBox aspects of the Linked Open Data (LOD) Cloud.

Typical Integration Problem:

Two ontologies or vocabularies (for instance FOAF and Schema.org) include definitions for the same class (or kind) of entity e.g., an Organization, and as a consequence we end up with Web accessible documents comprised of RDF statements that describe Organizations as instances of  foaf:Organization or schemaorg:Organization.

Challenge: How do we get a merged view of all the organizations, irrespective of how they've been described across various RDF documents?


Solution:

1. Make a mapping/bridge/meta ontology that uses owl:equivalentClass relations to indicate the fact that <http://xmlns.com/foaf/0.1/Organization> and <http://schema.org/Organization> are equivalent.

2. Load the mapping/bridge/meta ontology document into a data management system that's capable of applying reasoning and inference to the equivalence claim based on its comprehension of the relation semantics expressed

3. Access instances of the <http://xmlns.com/foaf/0.1/Organization> classes (e.g., by seeking a description of <http://xmlns.com/foaf/0.1/Organization> which should produce a solution that includes subjects of instanceOf (rdf:type) relations) -- and this will show a union of all instances of across <http://xmlns.com/foaf/0.1/Organization> and <http://schema.org/Organization>

4. Reverse the action in step 4 above -- the results should be the same.


Live Demo Link:

[1] http://lod.openlinksw.com/describe/?url=""> -- description of <http://xmlns.com/foaf/0.1/Organization> *without inference and reasoning enabled*, so the relations presented are specific to the aforementioned class.

[2] http://lod.openlinksw.com/describe/?url=""> -- description of <http://schema.org/Organization> *without inference and reasoning enabled*, so the relations presented are specific ot the aforementioned class .

[3] http://lod.openlinksw.com/describe/?url=""> -- description of <http://xmlns.com/foaf/0.1/Organization> *with inference and reasoning enabled*.

[4] http://lod.openlinksw.com/describe/?url=""> -- description of <http://schema.org/Organization> with *inference and reasoning enabled*.

--

Regards,

Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter Profile: https://twitter.com/kidehen
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LinkedIn Profile: http://www.linkedin.com/in/kidehen







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-- 

Regards,

Kingsley Idehen	      
Founder & CEO 
OpenLink Software     
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter Profile: https://twitter.com/kidehen
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