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LEDS
WWW.LEDS-PROJEKT.DE
TOWARDS VERSIONING OF ARBITRARY RDF DATA
FROMMHOLD M., NAVARRO PIRIS R., ARNDT N., TRAMP S., PETERSEN N., AND MARTIN M.
September 14, 2016
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LEDSINTRODUCTION
What it is?
Change tracking system for RDF datasets creating invertible patches for SPARQL Update queries.
What it is not (yet)?
A full-fledged versioning system with support for versioning operations.
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LEDSMOTIVATION
LEDS research project
Allow for co-evolution of RDF datasets outside and inside of an enterprise for better integration of public and private data.
http://www.leds-projekt.de/
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LEDSMOTIVATION
LUCID research project
Automatic distribution of RDF data changes in decentralized value chain networks to optimize the flow of information.
http://www.lucid-project.org/
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LEDSREQUIREMENTS
• Support for versioning operations• commute, revert, merge [Cassidy and Ballantine 2007]
• Detection of effective changes
• Full RDF support
• Protection against unperceived history manipulation
• Distributable patches
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LEDSFEATURES
ü Invertible patches
ü Change detection
ü Patches with quad and blank node support
ü Version integrity by signing of patches
ü eccrev: RDF changes and revisions vocabulary
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LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDSBLANK NODES
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LEDSBLANK NODES
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▼
LEDSBLANK NODES
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LEDSBLANK NODES
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LEDSBLANK NODES
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Tummarello et al. 2005:
Given an RDF statement s, the Minimum Self-contained Graph (MSG) containing that statement, written MSG(s), is the set of RDF statements comprised of the following:
1. The statement in question;
2. Recursively, for all the blank nodes involved by statements included in the description so far, the MSG of all the statements involving such blank nodes.
LEDSBLANK NODES
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LEDSBLANK NODES
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Now we are able to clearly identify the correct statement allowing us to revert the update.
LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDSARCHITECTURE
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LEDS
No Versioning
Versioning Async.
Versioning Sync.
0 2000 4000 6000 8000 10000 12000
BSBM QMpH
EVALUATION
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BSBM Explore and Update Benchmark (10 million statements)
LEDSEVALUATION
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Patch Size Benchmark• break even point: >10000 changed statements
0,0
48
s
0,0
75
s
0,4
02
s
4,8
5s
0,3
33
s
1,6
05
s
14
,90
5s
25
6,7
15
s
50 500 5000 50000
Changed Triples vs.SPARQL Update Execution Times
w/o versioning w/ versioning
LEDSFUTURE WORK
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• Integration into LEDS stack
• Implementation of versioning operations [Cassidy and Ballantine 2007]
• Support for more RDF repositories• Virtuoso✓• Stardog: provides versioning without blank node support
• Scalable hashing algorithm• current one based on [Carroll 2003]
• Benchmark for RDF versioning systems
LEDS
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Questions?
Web: http://aksw.org/MarvinFrommhold
Email: [email protected] /
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