Add new post

ifcOWL ontology file added for IFC4_ADD1

Download IFC4_ADD1.owl

There have been a number of EXPRESS-to-OWL conversion procedures suggested in the past few years, resulting in diverse ‘flavours’ of ifcOWL. It seems nevertheless useful to (also) have one common ifcOWL ontology which can at least be used as a reference ontology. Walter Terkaj and I have been trying to find such a common EXPRESS-to-OWL conversion procedure for IFC and corresponding ifcOWL ontology over the past few months. We tried to check on earlier versions and build a version that is not too specific (too much restrictions), but also not too generic (cfr. all strings in class ranges / no domains and ranges). Above all, we aimed at keeping the ontology in a DL profile, so that one can appropriately use it for reasoning purposes. I think we succeeded nicely.

The proposed conversion procedure and the resulting ifcOWL ontology are online: This is a proposal and request for comments: it would be good if the ontology and the conversion procedure is properly evaluated. We would appreciate your feedback in order to evaluate the ontology and perhaps still modify it!

What to do:
– go find the ontology file at the LinkedBuildingData portal or W3C Community group page
– go find a description of the conversion procedure at our W3C community page:
add feedback directly on the W3C community page or via the mailing list

Looking forward to hearing your feedback!! Note that is a public page, so you can share this information with whoever might be interested.

Call for Participation in Linked Building Data Community Group

The Linked Building Data Community Group has been launched:

This group brings together experts in the area of building information modelling (BIM) and Web of Data technologies to define existing and future use cases and requirements for linked data based applications across the life cycle of buildings. A list of recommended use cases will be produced by this community group.

The envisioned target beneficiaries of this group are both industrial and governmental organisations who use data from building information modelling applications and other data related to the building life cycle (sensor data, GIS data, material data, geographical data, and so forth) to achieve their business processes and whom will benefit from greater integration of data and interoperability between their data sets and the wider linked data communities. For example, benefit may be obtained by publishing and combining localised data on new cheaper building materials, energy efficient building devices and systems, along with real time data on weather patterns, energy prices and geodata. By making this data available to applications, they will be better able to support decision makers during the whole of the building life cycle, which includes design, construction, commissioning, operation, retrofitting/refurbishment/reconfiguration, demolition, and recycling of buildings.

The group will engage with these beneficiaries through surveys and events organised in conjunction with the affiliated workshop series on Linked Data for Architecture and Construction (LDAC).

In order to join the group, you will need a W3C account.

This is a community initiative. This group was originally proposed on 2014-06-26 by Kris McGlinn. The following people supported its creation: Kris McGlinn, Pieter Pauwels, Michael Petychakis, Jakob Beetz, Seppo Törmä. W3C’s hosting of this group does not imply endorsement of its activities.

The group now has access to W3C-hosted services for email, blog, wikis, irc, tracking tools, and more. Read more about tools and services available by default and upon request.

If you believe that there is an issue with this group that requires the attention of the W3C staff, please send us email on

Thank you,
W3C Community Development Team