Fuente: Wipo "digitalization" A building system operates to store a digital twin comprising a building graph, the building graph comprising a plurality of nodes representing a plurality of entities of a building and a plurality of edges between the plurality of nodes representing relationships between the plurality of entities. The instructions cause the one or more processors to determine a value for a functionality indicator for a piece of building equipment based on data received from the piece of building equipment, identify a first node of the plurality of nodes representing the functionality indicator by identifying an edge of the plurality of edges relating a second node of the plurality of nodes representing the piece of building equipment to the first node, and cause the first node to store the value for the functionality indicator, or a link to the value for the functionality indicator.