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This document addresses syntactic and semantic interoperability for information describing assets going through their life cycle in the built environment. It assumes the underlying technical interoperability provided already by the Internet/World Wide Web (WWW) technology-stack. The syntactic aspects relate to the Linked Data (LD)/Semantic Web (SW) formats and the SPARQL direct access method provided. The semantic aspects relate to the LD/SW-based information models in the form of thesauri and ontologies giving meaning to the information. The following information architecture (Figure 1) applies. This document specifies: - a conceptual "L1: Information language" with four RDF-based language bindings being SKOS, RDFS, OWL and SHACL, including: - a choice of 'linked data'/RDF-based formats (to be used for all modelling and language levels); and - a generic Top Level Information Model of a total "M1: Information model", here "an upper ontology", including: - a set of generic information modelling patterns for identification, annotation, enumeration datatypes, complex quality/quantity modelling, decomposition and grouping. This modelling approach for information models and information sets is relevant within the built environment from multiple perspectives such as: - Building information modelling (BIM); - Geographical information systems (GIS); - Systems engineering (SE); - Monitoring & control (M&C); and - Electronic document management (EDM). Annex E discusses in an informative way how the information models and sets relevant for these different worlds can be linked together using LD/SW technology. This document does not specify a full meta-'information model', sometimes referred to as a 'Knowledge Model (KM)'. EN ISO 12006-3 provides such an often used model for the built environment. In Annex D, Subclause D.3 it is shown how this existing model can be made compliant to this document. The only direct support for this meta level comes in the form of ...