. . . . . . "An abstract parent class for all observation-layer FDOs in a MAC FAIR Digital Twin. Concrete subclasses include `mac:RealWorldOccurrence` (Type 2), `mac:ComputationalPrediction` and its sub-hierarchy (Types 3–6), `mac:ExperimentalObservation` and its sub-hierarchy (Type 7), and `mac:WHOVariantClassification` (Type 8). Every member links to the FDT's anchor (a `mac:SpikeRBDVariant`) via `mac:isObservationOf`. This class is abstract: it carries no direct instances; all instances belong to one of its concrete subclasses." . "Observation" . "2026-05-22"^^ . . "2026-05-26T12:32:10Z"^^ . . . "Vocabulary term: mac:Observation" . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD3w/IUb755GIzp3ueODYkgELhyq4Clygb5Kspge50xo+n8uC/IvXwi+ukRjEpdfX/JZ09yKUCJ2AMMr/QchrsP1Xhg9Q3fEZ4E12XqFd5jX00Qs0K5XZwjBaV8NdDTJW9I4gpcyh0cry7hSBAWHkXEkqbK+lQvR4UFAKejFq6u/wIDAQAB" . "InmsnytLa1UFQsURADoQbSxaKU12m5JSDJQuWbxp7XRQs3A1FLH0kI+SEJv12HMrVHK5M2tSHCLIa5dfvIm5FDNrJ3x5cTEDFzHxuW3ghI1fqZdhMipj3kxVHy0AsdRcavKE5xP8Gyjt6CZ5YrUXvoA459hn4PR3yzC9j4RiHhI=" . . .