Brief introduction to linked data as well as to my research in this area.
Citation preview
Linked Data on the Web Query Processing Trustworthiness Olaf
Hartig
What is linked data ? 2 Query Processing and Trustworthiness in
the Web of Linked Data (Olaf Hartig)
The classic Web: Data exposed to the Web via HTML CIA World
MovieDB Factbook 3 Query Processing and Trustworthiness in the Web
of Linked Data (Olaf Hartig)
The classic Web: Information from single pages can be found via
search engines 4 Query Processing and Trustworthiness in the Web of
Linked Data (Olaf Hartig)
The classic Web: How about complex queries over multiple pages
/ data sources? What documentaries are filmed in countries with an
unemployment rate above 10%? Impossible. 5 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
What do we actually want? Use the Web like a single global
database CIA World MovieDB Factbook 6 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
Linked data enables such a Web of data CIA World MovieDB
Factbook 7 Query Processing and Trustworthiness in the Web of
Linked Data (Olaf Hartig)
Linked data enables such a Web of data Global Identifier: URI
http://...imdb.../genres/Documentary http://cia..../Albania
http://...imdb.../data/WarChildDocu CIA World MovieDB Factbook 8
Query Processing and Trustworthiness in the Web of Linked Data
(Olaf Hartig)
Linked data enables such a Web of data Global Identifier: URI
Data Model: RDF http://...imdb.../genres/Documentary quot;War
Childquot; http://cia..../Albania http://.../genre http://.../name
http://.../unemp_rate http://...imdb.../data/WarChildDocu 13.2 %
CIA World MovieDB Factbook 9 Query Processing and Trustworthiness
in the Web of Linked Data (Olaf Hartig)
Linked data enables such a Web of data Global Identifier: URI
Data Model: RDF Access Mechanism: HTTP
http://...imdb.../genres/Documentary quot;War Childquot;
http://cia..../Albania http://.../genre http://.../name
http://.../unemp_rate http://...imdb.../data/WarChildDocu 13.2 %
CIA World MovieDB Factbook 10 Query Processing and Trustworthiness
in the Web of Linked Data (Olaf Hartig)
Linked data enables such a Web of data Global Identifier: URI
Data Model: RDF Access Mechanism: HTTP
http://...imdb.../genres/Documentary Connection: Typed Links
quot;War Childquot; http: http://cia..../Albania http://.../genre
//.../f ilmin http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % CIA World MovieDB
Factbook 11 Query Processing and Trustworthiness in the Web of
Linked Data (Olaf Hartig)
Linked data enables such a Web of data Global Identifier: URI
What documentaries Data Model: RDF are filmedMechanism: HTTP
http://...imdb.../genres/Documentary Access in countries with an
unemployment rate Links Connection: Typed above 10%? quot;War
Childquot; http: http://cia..../Albania http://.../genre //.../f
ilmin http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % CIA World MovieDB
Factbook 12 Query Processing and Trustworthiness in the Web of
Linked Data (Olaf Hartig)
How do we query the whole Web of linked data efficiently? 13
Query Processing and Trustworthiness in the Web of Linked Data
(Olaf Hartig)
Contribution (I): Efficient query processing in the Web of data
14 Query Processing and Trustworthiness in the Web of Linked Data
(Olaf Hartig)
http://...imdb.../InBetweenMovie http://.../filming_location
?country . http://.../unemp_rate ?country ?u . Query
http://cia..../Albania http://...imdb.../genres/Drama htt p: / /. .
./fi lm in g quot;In Betweenquot; _lo ca http://.../genre tio n
http://.../name http://.../fil http://cia..../Canada ming_loca tion
http://...imdb.../data/InBetweenMovie Data 15 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
http://...imdb.../InBetweenMovie http://.../filming_location
?country . http://.../unemp_rate ?country ?u . Query
http://cia..../Albania http://...imdb.../genres/Drama htt p: / /. .
./fi lm in g quot;In Betweenquot; _lo ca http://.../genre tio n
http://.../name http://.../fil http://cia..../Canada ming_loca tion
http://...imdb.../data/InBetweenMovie Data Challenge: Intermediate
results drive the discovery of further, potentially relevant data
16 Query Processing and Trustworthiness in the Web of Linked Data
(Olaf Hartig)
http://...imdb.../InBetweenMovie http://.../filming_location
?country . http://.../unemp_rate ?country ?u . Query
http://cia..../Albania http://...imdb.../genres/Drama htt p:
http://.../unemp_rate / /. . ./fi lm in g 13.2 % quot;In
Betweenquot; _lo ca http://.../genre tio n http://.../name
http://.../fil http://cia..../Canada ming_loca tion
http://...imdb.../data/InBetweenMovie http://.../unemp_rate 6% Data
Challenge: Intermediate results drive the discovery of further,
potentially relevant data 17 Query Processing and Trustworthiness
in the Web of Linked Data (Olaf Hartig)
Is the data trustworthy? 18 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
Contribution (II): Trustworthiness in the Web of data
Representing Determining Accessing 19 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
What is trustworthy Web data? Trustworthiness of RDF statements
is the subjective belief or disbelief in the truth of the
statements. 20 Query Processing and Trustworthiness in the Web of
Linked Data (Olaf Hartig)
What is trustworthy Web data? Trustworthiness of RDF statements
is the subjective belief or disbelief in the truth of the
statements. uncertainty disbelief belief -1 0 1 21 Query Processing
and Trustworthiness in the Web of Linked Data (Olaf Hartig)
http://...imdb.../genres/Documentary quot;War Childquot; http:
http://cia..../Albania http://.../genre / / . . ./ f ilmin
http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % 22 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
http://...imdb.../genres/Documentary quot;War Childquot; http:
http://cia..../Albania http://.../genre / / . . ./ f ilmin
http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % TrustFct 23 Query
Processing and Trustworthiness in the Web of Linked Data (Olaf
Hartig)
http://...imdb.../genres/Documentary quot;War Childquot; http:
http://cia..../Albania http://.../genre / / . . ./ f ilmin
http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % TrustFct( )
http://cia..../Albania http://.../unemp_rate 13.2 % 24 Query
Processing and Trustworthiness in the Web of Linked Data (Olaf
Hartig)
http://...imdb.../genres/Documentary quot;War Childquot; http:
http://cia..../Albania http://.../genre / / . . ./ f ilmin
http://.../name g_lo catio http://.../unemp_rate n
http://...imdb.../data/WarChildDocu 13.2 % TrustFct( ,)
http://cia..../Albania http://.../unemp_rate 13.2 % 25 Query
Processing and Trustworthiness in the Web of Linked Data (Olaf
Hartig)
http://...imdb.../genres/Documentary quot;War Childquot; http:
http://cia..../Albania http://.../genre / / . . ./ f ilmin
http://.../name g_lo catio http://.../unemp_rate n [0.8]
http://...imdb.../data/WarChildDocu 13.2 % TrustFct( , ) = 0.8
http://cia..../Albania http://.../unemp_rate 13.2 % 26 Query
Processing and Trustworthiness in the Web of Linked Data (Olaf
Hartig)
Trust assessment strategies User-based 3 Party-based rd
Provenance-based 27 Query Processing and Trustworthiness in the Web
of Linked Data (Olaf Hartig)
Trust requirements in queries: http://...imdb.../InBetweenMovie
http://.../filming_location ?country . Query Data
http://cia..../China htt p: // . .. /f il m [- 0.7] i ng _lo http:
http://cia..../Albania //.../fi catio lming n _loca tion [0.8]
http://...imdb.../data/InBetweenMovie cation _lo ilming ./f
ttp://.. h [0.68] http://cia..../Canada 28 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
Trust requirements in queries: http://...imdb.../InBetweenMovie
http://.../filming_location ?country . [0.5 , 1.0] Query Data
http://cia..../China htt p: // . .. /f il m [- 0.7] i ng _lo http:
http://cia..../Albania //.../fi catio lming n _loca tion [0.8]
http://...imdb.../data/InBetweenMovie cation _lo ilming ./f
ttp://.. h [0.68] http://cia..../Canada 29 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
Trust requirements in queries: http://...imdb.../InBetweenMovie
http://.../filming_location ?country . [0.5 , 1.0] Query Data
http://cia..../China htt p: // . .. /f il m [- 0.7] i ng _lo http:
http://cia..../Albania //.../fi catio lming n _loca tion [0.8]
http://...imdb.../data/InBetweenMovie cation _lo ilming ./f
ttp://.. h [0.68] http://cia..../Canada 30 Query Processing and
Trustworthiness in the Web of Linked Data (Olaf Hartig)
Thank you! 31 Query Processing and Trustworthiness in the Web
of Linked Data (Olaf Hartig)
Attribution: http://www.flickr.com/photos/mrfaber/247946146/
www.opte.org http://www.flickr.com/photos/hartkopf/1586832162/ 32
Query Processing and Trustworthiness in the Web of Linked Data
(Olaf Hartig)