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

[Andrea Westerinen <arwesterinen@xxxxxxxxx>]

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.

-- 

Andrea Westerinen

T: 425.891.8407

arwesterinen@xxxxxxxxx or andreaw@xxxxxxxxxxx

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

organizingknowledge.blogspot.com

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="">2Fxmlns.com%2Ffoaf%2F0.1%2FOrganization&graph=http%3A%2F%2Fdata.reegle.info%2F&graph=http%3A%2F%2Fwww.openlinksw.com%2Fdata%2Fturtle%2Fontology_mappings%2Fschemas_mappings%2FSchemaOrgToOpenLink.ttl -- 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="">2Fschema.org%2FOrganization&graph=http%3A%2F%2Fdata.reegle.info%2F&graph=http%3A%2F%2Fwww.openlinksw.com%2Fdata%2Fturtle%2Fontology_mappings%2Fschemas_mappings%2FSchemaOrgToOpenLink.ttl -- 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="">2Fxmlns.com%2Ffoaf%2F0.1%2FOrganization&inf=http%3A%2F%2Fwww.openlinksw.com%2Fschemas%2Frdfs&graph=http%3A%2F%2Fdata.reegle.info%2F&graph=http%3A%2F%2Fwww.openlinksw.com%2Fdata%2Fturtle%2Fontology_mappings%2Fschemas_mappings%2FSchemaOrgToOpenLink.ttl -- description of <http://xmlns.com/foaf/0.1/Organization> *with inference and reasoning enabled*.

[4] http://lod.openlinksw.com/describe/?url="">2Fschema.org%2FOrganization&inf=http%3A%2F%2Fwww.openlinksw.com%2Fschemas%2Frdfs&graph=http%3A%2F%2Fdata.reegle.info%2F&graph=http%3A%2F%2Fwww.openlinksw.com%2Fdata%2Fturtle%2Fontology_mappings%2Fschemas_mappings%2FSchemaOrgToOpenLink.ttl -- 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
Google+ Profile: https://plus.google.com/+KingsleyIdehen/about
LinkedIn Profile: http://www.linkedin.com/in/kidehen







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