R2O+ODEMapster: Upgrading Relational Legacy Data to the Semantic Web

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Presentation transcript:

R2O+ODEMapster: Upgrading Relational Legacy Data to the Semantic Web Jesús Barrasa Rodríguez jbarrasa@eui.upm.es

What is R2O + ODEMapster? Framework to upgrade relational legacy data to the Semantic Web. Based on the declarative description of mappings between relational and ontology elements Exploitation of mappings by a domain independent processor. Jesús Barrasa Rodrígez (OEG-UPM)

The problem: No explicit semantics in databases Need to facilitate interchange, combination & automatic reasoning on their content. “One of the main driving forces for the Semantic Web will be the expression on the Web, of the vast amount of relational database information in a way that can be processed by machines“ Tim Berners Lee (sept 98) Jesús Barrasa Rodrígez (OEG-UPM)

The approaches: Info Integration: OBSERVER, PICSEL, MOMIS. Mediator approach. Wrapper dependent. Upgrade: D2R, KAON-Reverse. Only massive batch upgrade. Lack expressiveness Jesús Barrasa Rodrígez (OEG-UPM)

Our proposal: Mapping of independently conceived, developed and maintained ontologies & databases Declarative definition of correspondences with R2O and exploitation by domain independent engine Extensible set of primitives, not limited by DBMS expressivity Jesús Barrasa Rodrígez (OEG-UPM)

The mapping language: R2O Formal declarative mapping description language. XML based Extendable set of condition & transformation primitives Jesús Barrasa Rodrígez (OEG-UPM)

R2O: Conditions condition "match-regexp“ arg-restriction on-param "string“ has-column jobs.salaryRange on-param "regexp“ has-value ([:digit:]*)-([:digit:]*) Use of non-DBMS operations. Extendability Jesús Barrasa Rodrígez (OEG-UPM)

R2O: Transformations operation "concat" arg-restriction on-param "string1“ has-value "http://net.test.r2o/job-“ on-param "string2“ has-transform operation "concat“ has-column jobs.id has-column jobtypes.code Embeded operations. Complex tranformation definitions. Jesús Barrasa Rodrígez (OEG-UPM)

R2O: Attribute mappings attributemap-def“http://net.onto/jobs#type" selector applies-if condition […condition desc 1…] aftertransform operation […transformation desc 1…] aftertransform … If-then rule structure Jesús Barrasa Rodrígez (OEG-UPM)

The Query engine: ODEMapster Two operation modes: Query Driven: Query translator behavior. Selective & on line upgrade Massive Dump: Batch process. Creates a semantic RDF repository. Upgrades the full DB. Query Driven Massive Dump Jesús Barrasa Rodrígez (OEG-UPM)

ODEMapster execution Query and R2O mapping document are parsed Delegable part of query is translated into Data source’s SQL Retrieved results are post-processed (non delegable inferences are carried out) and ontology instances are generated. Jesús Barrasa Rodrígez (OEG-UPM)

Further information Ontology Engineering Group http://www.oeg-upm.net jbarrasa@eui.upm.es Jesús Barrasa Rodrígez (OEG-UPM)