ECPPM2016 - SimpleBIM: from full ifcOWL graphs to simplified building graphs

PieterPAUWELS-pipauwel.pauwels@ugent.be
AnaROXIN–ana-maria.roxin@u-bourgogne.fr
SimpleBIM: From full ifcOWL graphs
to simplified building graphs
Pieter Pauwels – Ghent University (Belgium)
Ana Roxin – University of Burgundy (France)
Wednesday, September 7th 2016
Limassol, Cyprus

ECPPM 2016 - An Agile Process Modelling Approach for BIM Projects

SPF XML RDF

SimpleBIM

Advantages
◼ Find the information you need
◼ Easier to respond to data exchange requirements
(MVDxml)

METHOD & SETUP

ifcOWL to simpleBIM ?
RDFIFC-SPF
ifcOWLEXPRESS
RDF
simpleBIM
Converter?
Rules?
…?
Converter?
Rules?
…?ECPPM 2016 - An Agile Process Modelling Approach for BIM Projects

TEST

Statistics of the test file
◼ File size: 767kB
◼ Triple count: 10,173 distinct
◼ Class instances: 4222 (5535)
233 / 4222 ifcowl:IfcRelationships
686 / 4222 list:OWLList
417 / 686 ifcowl:IfcLengthMeasure_List
764 / 4222 expr:STRING

Simplification strategy
1
•Removing geometric information
2
•Unwrapping data types
3
•Rewriting properties
4
•IfcRelationship instances

Simplifying IfcRelationship instances

Unwrapping data types

Removing geometric information

Rewriting PSETs and property values

RESULTS

Simplification strategy
1. Removal of geometric information
• 10,173 triples to 6,927 triples
• 767kb to 476kb
• 31% (file size) – 38% (triple count)
2. Unwrapping data types
• 3,897 triples
• 279kb

Simplification strategy (2)
3. Rewriting properties
• 1,630 triples
• 112kb
4. IfcRelationship instances
• 1,339 triples
• 83kb

Results
Model File size Number of triples
ifcOWL simpleBIM ifcOWL simpleBIM
1 767kb 83kb 10 173 1 339
2 16,7MB 1029kb 225 135 16 836
Average reduction of 91,58% Average reduction of 89%
REDUCTION TO:
8,5% of file size
10,3% of triple count

CONCLUSION & FUTURE WORK

Conclusion
Our approach allows adapting an RDF graph (in
ifcOWL) into diverse alternative, less complex graphs.
usable extension of ifcOWL responding to use case
Similar approaches:
The ifcWOD extension (Mendes et al. 2015b)
private industrial simplification mechanisms.
SPARQL CONSTRUCT queries (C. Zhang, 2016)

Future Work
◼ Transform into alternative ontologies:
DogOnt (Bonino & Corno 2008)
OntoFM (Dibley et al. 2012)
sumo ontology (Niknam and Karshenas 2015)
◼ Perform additional benchmarks, in order to
highlight eventual advantages of SimpleBIM for
SPARQL query simplification
◼ Examine the related query execution time

Thank you for your attention !
Pieter Pauwels, Ghent University (Belgium)
pipauwel.pauwels@ugent.be
Ana Roxin, University of Burgundy (France)
ana-maria.roxin@u-bourgogne.fr
Authors wish to thank the Special Research Fund (BOF) of Ghent University for their generous support,
and the French Agency of Research (ANR) for the financing of the BigSTEP project (funding ANR-16-
MRSE-0024-01).

ECPPM2016 - SimpleBIM: from full ifcOWL graphs to simplified building graphs

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