sparqlstream and morph-streams
DESCRIPTION
TRANSCRIPT
http://streamreasoning.org/sr4ld2013
+stream
s
Virtual RDF views over data streams
1
SPARQLStream
Virtual RDF Stream
DSMS CEP Sensor middleware
…
queries
users, applications
query processing
RDF Stream Processor
Morph-streams
data layer
http://streamreasoning.org/sr4ld2013 2
Morph-streams: Overview
Query rewriting
Query Processin
gClien
t
SPARQLStream
[tuples][triples/
bindings]
Algebra expression
R2RML Mappings
Morph-streams procesing SPARQLStream queries
SELECT ?windspeedFROM STREAM <http://ssg4env.eu/SensorReadings.srdf> [NOW–5 HOUR]WHERE { ?obs a ssn:ObservationValue; qudt:numericalValue ?windspeed; FILTER (?windspeed>10) }
SELECT sp_wind FROM wan7.win:time(5 hour) WHERE sp_wind >10
π timed,sp_wind
ω
σsp_wind>10
5 Hour
wan7
Data translation
SNEE
Esper
GSN
Cosmpull/push
https://github.com/jpcik/morph-streams
Other
http://streamreasoning.org/sr4ld2013
SPARQLStream: examples
3
PREFIX sr4ld: <http://www.streamreasoning.org/ontologies/socialsensor,owl#>SELECT ?room FROM NAMED STREAM <http://www.streamreasoning.org/streams/socialsensor.srdf> [NOW-10 S] WHERE { ?obs sr4ld:observedBy ?sensor. ?obs sr4ld:where ?room.}
SPARQLStream
All rooms where something was observed in the last 10s
PREFIX sr4ld: <http://www.streamreasoning.org/ontologies/socialsensor,owl#>SELECT (COUNT(?person) AS ?nmb) ?room FROM NAMED STREAM <http://www.streamreasoning.org/streams/socialsensor.srdf> [NOW-10 S] WHERE { ?obs sr4ld:who ?pers. ?obs sr4ld:where ?room.}GROUP BY ?room
Number of persons observed in each room in the last 10s
http://streamreasoning.org/sr4ld2013
Underlying Query Processors
4
SELECT ?windspeedFROM STREAM <http://ssg4env.eu/SensorReadings.srdf>
[NOW–5 HOUR TO NOW]WHERE { ?obs a ssn:ObservationValue; qudt:numericalValue ?windspeed; FILTER (?windspeed>10) }
SELECT sp_wind FROM wan7 [FROM NOW-5 HOURS TO NOW] WHERE sp_wind >10
timed,sp_wind
π
ω
σsp_wind>10
5 Hour
wan7
SELECT sp_wind FROM wan7.win:time(5 hour) WHERE sp_wind >10
http://montblanc.slf.ch:22001/multidata?vs[0]=wan7& field[0]=wind_speed_scalar_av&c_min[0]=10& from=15/05/2012+05:00:00&to=15/05/2012+10:00:00
http://api.cosm.com/v2/feeds/14321/datastreams/4?start=2012-05-15T05:00:00Z&end=2012-05-15T10:00:00Z
Query rewriting
R2RML
SNEE (DSMS)
Esper (DSMS)
GSN (middlwr)
Cosm
SPARQLStrea
m
http://streamreasoning.org/sr4ld2013 5
Resources
Morph-Streams• https://github.com/jpcik/morph-streams• http://transporte.linkeddata.es
Read out more• Enabling Query Technologies for the Semantic Sensor Web. J.-P. Calbimonte,
H. Jeung, O. Corcho and K. Aberer. IJSWIS, Volume 8(1)., 2012• Enabling Ontology-based Access to Streaming Data Sources. J.-P. Calbimonte,
O. Corcho and A. J. G. Gray. In ISWC 2010
Contact point• [email protected]• [email protected]