Efficient Binary Serialization of IFC Models Using HDF5

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IFC in its current text-based form IFC-SPF is by far the most prevalent encoding

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IFC in its current text-based form with geometric, …

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IFC in its current text-based form with geometric, relational and semantic data

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IFC in its current text-based form Advantages Interoperable (machine independent) Human readable Disadvantages Large file size Slow parsing speed No random access seeking No ordering imposed on instances

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file (bytes)

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BIM usage in the construction sector

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Increasing level of detail Leads to increased file size 9 LOD 200 LOD 400 Source: http://bimforum.org/wp-content/uploads/2015/11/Files-1.zip

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Multi-disciplinary nature with a selective information need 10

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Solution

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HDF5

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Implementation C++ executable using IfcOpenShell and the HDF5 software library to write IFC-HDF files: github.com/ISBE-TUe/IfcOpenShell-HDF5 15

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#1027=IFCPROPERTYSINGLEVALUE('IsExternal',$,IFCBOOLEAN(.T.),$); #1028=IFCPROPERTYSINGLEVALUE('Youngs modulus (cm3)',$,IFCREAL(47.3),$); #1029=IFCPROPERTYSINGLEVALUE(‘Steal Quality',$,IFCLABEL('S 235 JR'),$); Space allocated for all possible valuations

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Findings 21

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Number of entity instances in file (millions) ⇢ File size (megabytes) ⇢

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Number of entity instances in file (millions) ⇢ Time (seconds) ⇢ Proposed binary serialization yields near-constant access times due to hierarchical storage

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Future research SPARQL query language implementation • Further validate access time with realistic relational access patterns • Provide unified querying interface with recent IfcOWL initiative Formalize standardization proposal

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Conclusions HDF5 offers a valuable serialization alternative for text-based IFC-SPF files Near-constant access times facilitate a multi-disciplinary context and querying Self-documenting nature improves interoperability and extensibility

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