DAIS for RDF BOF Isao Kojima kojimani aist

DAIS for RDF BOF Isao Kojima kojima@ni. aist. go. jp Data Grid Team Grid Technology Research Center AIST Japan http: //www. dbgrid. org/

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Introduction • Who am I? Isao Kojima AIST, Japan • Currently leading following AIST datagrid research topics related with RDF – OGSA-DAI-RDF : Extending OGSA-DAI world to the Semantic Web • RDF processing OGSA-DAI Activities • Query language SPARQL – RDFCube: P 2 P based Distributed RDF Query Processing • Construct a special index structure on top of DHT • Provides efficient RDF set-oriented operation – S-MDS : enhance MDS 4 framework to support “S”(semantics) • Supports OWL-S ontology for data/computing resources • Supports Continual RDF Query for dynamic resource monitoring – Target: Large scale distributed RDF data – Approach: Query language based application

RDF (Resource Description Framework) • Common metadata/knowledge description in Semantic Web Applications • Number of RDF data is increasing=>Need for database technology/specs Trusted SW Proof creator Rules matono Ontology subject predicate <? xml version="1. 0"? > <rdf: RDF xmlns: rdf="http: //www. w 3. org/1999/02/22 -rdf-syntaxns#" xmlns: dc="http: //dublincore. org/2001/08/14/dces#"> <rdf: Description about="http: //gtrc. aist. go. jp/~a. matono"> <dc: creator>matono</dc: creator> </rdf: Description> </rdf: RDF> XML-based Format object DAIS Next? DAIS NOW RDF Schema Signature http: //gtrc. aist. go. jp/~a. matono Logic Encryption Statement: “creator of “http: //gtrc. aist. go. jp/~a. matono/ is matono” RDF XML Namespaces URI Unicode Layer Cake of the Semantic Web

DAIS for RDF: initial proposal http: //www. dbgrid. org/dais-recharter-bof. htm Focus/Purpose RDF (resource description framework) is a standard framework for expressing semantic metadata and is widely used in semantic web and semantic grid applications. An enormous amount of RDF data has been created and stored in various applications and research projects. The query language SPARQL is currently under discussion at W 3 C as a standard query language for RDF. DAIS-WG, which aims to provide a standard interface for databases, should cover RDF databases within the OGSA-based grid framework. Scope: Setting RDF data access specification (WS-DAI-RDF) based on the existing WS-DAI specification, which is discussed within the DAIS-WG.

What we want to do (Detail of the DAIS specs will be given by DAIS-WG) WS-DAIR WS-DAIX WS-DAIO Sets general pattern for other DAIS realizations. WS-DAI-RDF (&WS-DAI-Ont? ) Files Will be defined in DAIS Looking for more authors Currently being defined In DAIS Draft based on Posix. Looking for a willing author.

Aim of the BOF • (Formally) Re-chartering of current DAIS-WG – to add RDF specialization – (we must set goals, milestones and deliverables) • BOF= 1 st Step to Share the Motivation & Information – – – GGF: DAIS-WG GGF: Semantic Grid RG W 3 C: Data Access Working Group (SPARQL) Systems and Applications R&D activities • Discussion – Scope – Approach – Schedule & Outputs

Agenda Introduction & Background – – Motivation for the BOF Related GGF Specs and Research Activities – – DAIS WG: Semantic Grid RG: Dave Pearson Carole Goble R&D Projects (current potential candidates for the reference implementations) – – – Ontogrid, WS-DAI-Ont : OGSA-DAI-RDF & Related Issues : Asuncion Gomez Perez Isao Kojima If anybody want to present something, feel free to present here. Discussion:

OGSA-DAI-RDF and Related Topics Isao Kojima Data Grid Team Grid Technology Research Center AIST Japan

• OGSA-DAI-RDF implementation – Add RDF database type to uk e-Science OGSA-DAI database middleware – RDF handling Activities including SPARQL Query. Statement. Activity – Provides GUI for SPARQL – Supports OWL/RDFS ontology – Supports Jena and Sesame RDF(SPARQL) Activities DBMS Oriented Research （currently focus on the Query language) Presented Yesterday at Semantic Grid Workshop Presentation is on http: //www. semanticgrid. org/GGF/ggf 16/ and soon also on our Website.

Query Language: What is SPARQL? SQL-like RDF Query Language PREFIX rdf: <http: //www. w 3. org/1999/02/22 -rdf-syntax-ns#> PREFIX dc: <http: //purl. org/dc/elements/1. 1/> PREFIX : <http: //example/ns#> SELECT ? book ? title WHERE { ? t rdf: subject ? book. ? t rdf: predicate dc: title. ? t rdf: object ? title. ? t : said. By " Bob". } Will be standard at W 3 C data access working group (DAWG) Current: Last call working draft: comments due 10 th Feb. “SPARQL Query Result XML Format” is also on the same schedule <? xml version="1. 0"? > <sparql xmlns="http: //www. w 3. org/2005/sparql-results#"> <head> <variable name="x"/> <variable name="hpage"/> <variable name="name"/> <variable name="mbox"/> <variable name="blurb"/> </head>. . . </sparql>

SPARQL example on OGSA-DAI-RDF

Distributed SPARQL Processing using OGSA-DAI Activity Framework

Related Issues

• Products: DAIS for RDF – RDF database systems RDF storage is now commonly used • Jena • Sesame • Oracle RDF option etc… and the impact of the spec will be large • Specifications : – W 3 C RDF-related standards Little need to – RDF Query Language SPARQL will rely be W 3 C standard on unstable specs • SPARQL/XML format • SPARQL protocol • Grid-based R&D Projects : We already have 2 potential candidates for reference implementations for coming WS-DAI-RDF/Ontology – OGSA-DAI-RDF (by AIST) – Ontogrid WS-DAI-Ont & WS-DAI-Ont-RDF (Ontogrid)

DAIS and SPARQL Protocol • W 3 C Data Access Working Group defined SPARQL interface protocol – WSDL 1. 1 and HTTP binding are discussed. Working Draft is on the same schedule with SPARQL, SPARQL/XML (HTTP) • Simple interface – No WSRF – No GSI(login)

• SPARQL protocol and WS-DAI (and WS-DAI-RDF) Must have some interoperability • Technical problem: must be discussed. • Liaison with W 3 C activity : if needed. – W 3 C RDF DAWG (Data Access Working Group) – Current Possible Contact Person: Hiroyuki Sato (NTT) will help us.

Discussions • Scope & Target • Discussion Format • Goals • Milestones/Schedules • • Deliverables …….

Initial proposal was: • Goals The following will be added to the current DAIS goals/milestones. Data Service Specification: RDF Realization (ontology? ) • Milestones Sep 2006: March 2007: June 2007: • Initial draft of the WS-DAI-RDF specifications, which is consistent with WS-DAI and the OGSA data architecture. Revised draft of the WS-DAI-RDF specifications. Final specifications, submitted as a recommendation GGF Document GGF Recommendation (Due June 2007) Web Services Data Access and Integration – The RDF Realization (WS-DAI-RDF) small scope, short term activity