OGSA-DAI-RDF & Its Ontology Interfaces Isao Kojima and Masahiro Kimoto Data Grid Team, Grid Technology Research Center AIST （ ↓ ）,Japan RDF, Ontologies and Meta-Data Workshop at Uk e-Science Centre 8 th June, 2006

Summary OGSA-DAI RDF Implementation of OGSA-DAI RDF Prototype Web(Grid) Service based access to RDF databases RDF – Supports RDF database type to OGSA-DAI database middleware ActivitiesSPARQL – RDF handling Activities including SPARQL query processing Supports Jena and Sesame Supports RDFS/OWL –Ontology –Ontology Interfaces implementation Based on the Ontogrid’s WS-DAIO initial(old) Proposal Specs –Schema & Instance Handling Interfaces –Supports Jena –Supports RDFS/OWL –Current Status and Future Directions

Approach OGSA-based: Web Service InterfacesOGSA-based: Web Service Interfaces –Use of Globus Toolkit/WS-RF –Can be combined with other Grid tools (GRAM,MDS,…..) Query Language (SPARQL)Query Language (SPARQL) –W3C Standard Query Language for RDF –Multi-Platform approach To support Jena, Sesame,,,,,,, (Oracle?) OGSA-DAI: –Activity Framework To combine RDF databases other data resources –XMLDBs, Relational DBs(and Files) To achieve RDF database workflow programming –DataConversion, Data Transfer,( Web Services)

OGSA-DAI OGSA-DAI: –UK e-Science R&D project for grid DB middleware Service-based Database Query and Integration –RDB:SQL (Oracle,PostgreSQL,MySQL,DB2,,,) –XML-DB: XPath and XQuery (Xindice,eXist,,,) –Integration tool OGSA-DQP for RDBs Supports Grid Middleware –WS-RF(Globus Toolkit 4) –WS-I(OMII)

OGSA-DAI-RDF Not available for some version OGSA-DAI Activities: Set of Primitives for Data Processing Relational, XML, File Transfer, Data Conversion/Compression RDF Activities OGSA-DAI-RDF: Set of RDF Processing Activities

Implemented Activities (Platform Independent = All activity supports Jena and Sesame) 1.SPARQL QueryStatement Activity –W3C Standard SPARQL for Jena/Sesame 2.RDF Resource(triple)Management Activity –Create/Delete RDF triples,statements 3.RDF Collection(model)Management Activity –Create/Delete/List RDF databases(model,repository) 4.RDF BulkLoad Activity –Bulk loading functions of RDF triples –To achieve common Interface Pattern with Relational, XML-DBs. 5. Ontology Interfaces (based on the Ontogrid’s WS-DAIO initial(old) specs) - Schema level Activity - Instance level Activity Query (SPARQL) & Instance Level (Without ontology) Appoach

OGSA-DAI-RDF demo(1): Multi-Platform Environment SPARQL GUI Query Interface for Jena/Sesame –Modified OGSA-DAI DataBrowser OGSA-DAI Data Service (WS-RF and WS-I) Sesame Jena SPARQL Statement Result is SPARQL/XML Format

OGSA-DAI Activity Framework RDF Activities can be combined with other OGSA-DAI Activities –Data Compression,Conversion and Transfer –Other database Resources (SQL-DB, XML-DB) Activity Programming –Support of Workflow Programming –Simple Distributed Processing Site1: 1.SPAQL query result is converted with XLSTransform Activity 2. The converted data is send to site2 by deliverTo Activity Site2: 1.Data is received with delverfrom Activity 2.Triples are inserted into the temporary model by ResourceManagement Activity 3.Anthoer query is done for this temporary model

Demo(2) : Distributed SPARQL Processing ( to show the power of OGSA-DAI Activity Framework) Parallel & Synchronized Data Processing over 3 different sites can be programmed with this Framework

Currently Supported Platforms Jena and Sesame –RDF(S) and OWL for Jena Middleware-> Depends on the Underlying Platforms –Operational Semantics –Functional Limitation Supported Implementation Type –On DBMS(RDB as default) –On Memory (Jena) –On File (Sesame) Can be specified OGSA-DAI resource config file Dai.data.resource.type=RDF

Function Summary Functions Future WS-DAI-RDF/Ont OGSA-DAI-RDFNotes and Problems DataRDF and RDFSRDF, RDFS and OWLA Single Architecture to cover OWL Ontology InterfaceWS-DAI-OntSchema Activity Instance Activity Must follow current WS-DAI-RDFOnt specs Query LanguageSPARQLSPARQL QueryStatement Activity Must have some compatibility with W3C SPARQL protocol Result SetSPARQL XML Result Format SPARQL XML Result Format UpdatesSupports basic Update Activity Graph ManagementGraph(Collection) Management Activity Must cope with OGSA-DAI resource configuration Bulk OperationBulkLoad Activity Factory Operations

Implemented Ontology Interface Activities SchemaActivityInstanceActivity AddConcept RemoveConcept GetConcept GetConcepts HasConcept AddSubclassOfRelation RemoveSubclassOfRelation GetRelatedConcepts AddIndividual RemoveIndividual GetIndividual GetIndividuals HasIndividual AddInstanceOfRelation RemoveInstanceOfRelation GetIndividualParents Basic Ontology Handling Functions Parent/Child Ancestor/Descend ant, Sibling,,,, Basic Instance Handling Functions Add/Remove Get/Has,,, Individual This is only a prototype based on the obsolete specs To find the usefulness of these kind of interfaces To get the feedbacks for the future ontology interface discussion To explore the integrated architecture with Query interface and Ontology Interface To be a candidate for the second GGF reference implementation

PerformDocument Example: NCI Cancer Ontology Access Example of the Ontology <perform xmlns=" <getRelatedClasses fromData="rdb" className=" cology.owl#Chemotherapy" lineageRelation="ancestor"> cancerOntology NCI Cancer Ontology Get the ancestor of The class “Chemotherapy” Import of NCI cancer ontology using the Activity Framework 1.Create a Model on RDB using RDF Collection(model)Management Activity 2.Get the data from the NCI site using the OGSA-DAI deliverFromActivity 3.Uncompress the file using the OGSA-DAI gZip Activity 4.Load the data with our RDF BulkLoad Activity

Execution Examples 1.GetClass 2.HasClass 3.GetRelatedClasses(ancest or) 4.areClassesRelated(Parent ?) Planned Applications Grid Database Integration with Ontology Clinical/Bioinformatics Integration (with U-Tokyo) AIST Geogrid Project (based on GEON)

Specifications Our system aims to cover OWL and RDF(S) –We think it is very convenient to cover them in a single framework. First GGF DAIS specs for RDF will target RDF(S) –WS-DAI-RDF/Ont architecture should have some extensibility/compatibility for future OWL –Need to Synchronize R&D and the Spec Discussion Must have some compatibility with W3C SPARQL Protocol Security and Authorization: No idea at now Implementations Jena: – Simple wrapping of Jena Ontology API Sesame: – Each interface message is converted to the query representation On top of the current OGSA-DAI-RDF query module –Our current approach is based on SPARQL, not SeRQL Aims to be a yet another implementation of WS-DAI-RDF/Ont Restricted with Sesame SPARQL implementation Should wait for the future stable releases Feedbacks and Problems

Current Implementation & Roadmap Current Prototype OGSA-DAI-RDF Activities Query Interface=full function with basic updates Ontology interface= basic functions of WS-DAIO Demo Server environment is already set-up –If you have OGSA-DAI 2.1 and download the configuration XML, you can access our demo site using SPARQL –Current config xsds will be downloadble soon. June, st Release (without ontology) Version 0.9 Ready to be released now. Re-designing the interface: Possible inconsistency with future releases. Almost no english document Sep or Nov nd Release Version1.0 with Stable Spec (with ontology interface????)

Future Directions Distributed & Scalability –Distributed Query Processing? –Combine with P2P Query Processing? (presented yesterday by A.Matono) We think the single site performance is already the matter of the DB vendors. Multi-site performance and optimization is our concern Applications (related topic will be presented today by S.Mirza) –Resource Discovery & Management –Service Management for the Semantic SOA. –Database Integration (Geosciences, Clinical-bioinformatics) Collaboration –DAIS-RDF/Ont Spec Discussions / Ontogrid Project (F2F will be tomorrow) –Semantic Web Group within AIST