SCOVO: Using Statistics on the Web of Data Michael Hausenblas, Wolfgang Halb, Yves Raimond, Lee Feigenbaum, Danny Ayers ESWC2009 In-Use Track, 2009-05-04, Heraklion, Greece

SCOVO:

Using Statistics on the Web of Data

Michael Hausenblas, Wolfgang Halb, Yves Raimond, Lee Feigenbaum, Danny Ayers

ESWC2009 In-Use Track, 2009-05-04, Heraklion, Greece

Agenda SCOVO Motivation Requirements and Issues Statistical Modelling Framework Comparison Usage

SCOVO Motivation

Requirements and Issues

Statistical Modelling Framework

Comparison

Usage

Motivation SCOVO: S tatistical Co re Vo cabulary http://sw.joanneum.at/scovo Statistical data is present everywhere

SCOVO: S tatistical Co re Vo cabulary http://sw.joanneum.at/scovo

Statistical data is present everywhere

Motivation Web of Data is for sharing, accessing and using DATA SCOVO aims at making statistical data easier and better accessible on the Web of Data

Web of Data is for sharing, accessing and using DATA

SCOVO aims at making statistical data easier and better accessible on the Web of Data

Motivation Based on 3 distinct efforts r iese – ‚RDFizing and Interlinking the EuroStat Data Set Effort‘ http://riese.joanneum.at Eurostat data (official European statistics) US Census Bureau‘s annual Statistical Abstract Publishing UN and OECD http://oecd.dataincubator.org/

Based on 3 distinct efforts

r iese – ‚RDFizing and Interlinking the EuroStat Data Set Effort‘

http://riese.joanneum.at

Eurostat data (official European statistics)

US Census Bureau‘s annual Statistical Abstract

Publishing UN and OECD

http://oecd.dataincubator.org/

Issues Handling of Multiple Dimensions Reusability and Uptake Structural vs. Domain Semantics Performance and Scalability Issues

Handling of Multiple Dimensions

Reusability and Uptake

Structural vs. Domain Semantics

Performance and Scalability Issues

Requirements Usable on the Web of Data (URIs, RDF, etc.) Extensible both on schema level and instance level Light-weight, addressing uptake, and performance and scalability issues.

Usable on the Web of Data (URIs, RDF, etc.)

Extensible both on schema level and instance level

Light-weight, addressing uptake, and performance and scalability issues.

Statistical Modelling Framework

SCOVO http://purl.org/NET/scovo

Comparison

Example From http://purl.org/NET/scovo SELECT ?airport_name ?period ?percent_ontime_arrivals FROM <http://sw.joanneum.at/scovo/otf-example-full.rdf> WHERE { ?item rdf:type scv:Item ; scv:dimension ?airport; scv:dimension ?time_period; scv:dimension ex:ota ; rdf:value ?percent_ontime_arrivals . ?airport rdf:type ex:Airport ; dc:title ?airport_name . ?time_period rdf:type ex:TimePeriod ; scv:min ?min ; scv:max ?max ; dc:title ?period . FILTER ( ?min > &quot;2006-02-01&quot; && ?max < &quot;2006-08-01&quot;) }

From http://purl.org/NET/scovo

SELECT ?airport_name ?period ?percent_ontime_arrivals

FROM <http://sw.joanneum.at/scovo/otf-example-full.rdf>

WHERE {

?item rdf:type scv:Item ;

scv:dimension ?airport;

scv:dimension ?time_period;

scv:dimension ex:ota ;

rdf:value ?percent_ontime_arrivals .

?airport rdf:type ex:Airport ;

dc:title ?airport_name .

?time_period rdf:type ex:TimePeriod ;

scv:min ?min ;

scv:max ?max ;

dc:title ?period .

FILTER ( ?min > &quot;2006-02-01&quot; && ?max < &quot;2006-08-01&quot;)

}

Usage: riese R DFizing and I nterlinking the E urostat data S et E ffort http://riese.joanneum.at Contributing to Linking Open Data project Offers linked data version of Eurostat data for both humans and machines (first LOD-in-RDFa dataset in the cloud)

R DFizing and I nterlinking the E urostat data S et E ffort

http://riese.joanneum.at

Contributing to Linking Open Data project

Offers linked data version of Eurostat data

for both humans and machines (first LOD-in-RDFa dataset in the cloud)

Usage: voiD voiD – Vocabulary of Interlinked Datasets http://semanticweb.org/wiki/VoiD Formal description of linked datasets Uses SCOVO to express stats about triples, interlinking, resources, etc.

voiD – Vocabulary of Interlinked Datasets http://semanticweb.org/wiki/VoiD

Formal description of linked datasets

Uses SCOVO to express stats about triples, interlinking, resources, etc.

Usage: RDFStats http://semwiq.faw.uni- linz.ac.at/node/9

Conclusion Modeling statistics is a non-trivial task (wide range of requirements, etc.) SCOVO is usable, generic, simple However, there are issue: Aggregation Domain semantics

Modeling statistics is a non-trivial task (wide range of requirements, etc.)

SCOVO is usable, generic, simple

However, there are issue:

Aggregation

Domain semantics

Let‘s discuss!

Let‘s discuss!