There is a sign-up schedule for this talk at http://www.cs.utex

as.edu/department/webevent/utcs/events/cgi/list_events.cgi.

Type of Ta

lk: UTCS Colloquium

Speaker/Affiliation: Olaf Hartig/Humboldt-Universi

tät zu Berlin, Databases and Information Systems Group

Date/Time: We

dnesday, October 21, 2009/ 4:00 p.m.

Location: ACES 2.402

Host:
Daniel Miranker

Talk Title: "Executing SPARQL Queries over the Web of
Linked Data"

Talk Abstract:
The Web of Linked Data forms a single,
globally distributed dataspace. Due to the openness of this dataspace, it
is not possible to know in advance all data sources that might be relevant
for query answering. This openness poses a new challenge that is not addre

ssed by traditional research on federated query processing.

In this ta

lk I will present novel approach to execute SPARQL queries over the Web of

Linked Data. The main idea of our approach is to discover data that might b

e relevant for answering a query during the query execution itself. This di

scovery is driven by following RDF links between data sources based on URIs
in the query and in partial results. The URIs are resolved over the HTTP p

rotocol into RDF data which is continuously added to the queried dataset.

n
Speaker Bio:
Olaf is a Ph.D. student with the Database and Informatio

n Systems Group at Humboldt-Universität zu Berlin. His research focuses on
query processing in the Web of Linked Data. His aim is to develop concepts
that allow to query this Web of Linked Data as if it is a giant global dat

abase. As project maintainer and lead developer he is implementing these co

ncepts in the free software projects "Semantic Web Client Library" and the

"SQUIN query interface." He presented the approach to consume Linked Data a

s realized in the Semantic Web Client Library during the tutorial on publis

hing Linked Data at the 7th International Semantic Web Conference. In addit

ion to the development of tools that enable applications to consume Linked

Data, Olaf also has extensive experience in realizing such Linked Data bas

ed applications itself. Recently, his "Database Researchers Map", a Linke

d Data based Web application, won the Semantic Scripting Challenge 2009. D

uring his work as a teaching assistant at Humboldt-Universität Olaf gives

tutorials and seminars and he supervises students who work on their diploma

, master, or semester thesis.