The document discusses the 4th International Workshop on Linked Data in Architecture and Construction (LDAC), which took place in Madrid, Spain. It highlights the establishment and activities of the Linked Data Working Group (LDWG), which aims to standardize the use of linked data in building information modeling (BIM) and related technologies. Various initiatives and events supporting this community are mentioned, emphasizing the need for collaboration in defining use cases and requirements for linked data applications throughout the building life cycle.