LDAC 2021: Linked Data in Architecture and Construction: Proceedings of the 9th Linked Data in Architecture and Construction Workshop, Luxembourg, Luxembourg, October 11-13, 2021

The LDAC workshop series provides a focused overview on technical and applied research regarding the usage of semantic web, linked data and web of data technologies for architecture and construction (design, engineering, construction, operation, etc.). The workshop aims at gathering researchers, industry stakeholders, and standardization bodies of the broader Linked Building Data (LBD) community. The aim of the workshop is to present current developments, coordinate efforts, gather stakeholders, and elaborate use cases.

We are pleased to collect in this volume the papers that were submitted and presented during the 9th Linked Data in Architecture and Construction Workshop. The workshop took place in Luxembourg, collocated with the 38th CIB W78 conference on Information and Communication Technologies. The joint event was organised by the Luxembourg Institute of Science and Technology (LIST), in collaboration with Cardiff University and the European Construction Technology Platform (ECTP).

The 9th LDAC workshop took place from 11 to 13 October 2021, followed by the CIB W78 conference from 13 to 15 October. During these days, the workshop attendees attended the presentations of thirteen peer reviewed paper submissions in the proceedings. Furthermore, the workshop included an industry session, with 5 contributions.