Despite unprecedented growth in biodiversity data, a persistent gap remains between what is known and what is acted upon. Existing frameworks such as the FAIR and CLEAR Principles have improved data accessibility and interpretability but do not provide the components required to translate knowledge into context-sensitive action. We argue that closing this knowledge-action gap requires a shift toward statement-centred and action-oriented knowledge infrastructures. We identify a fundamental distinction between actionability as the structural capacity of a representation to support operations and applicability as the epistemic validity of using that knowledge in a specific context. Building on the Semantic Units Framework, we introduce Action Units as structured extensions of plan specifications that make applicability conditions and contextual grounding explicit as first-class typed components. Three types are distinguished, epistemic, transformational, and intervention action units, corresponding to three operation classes that define a minimal operational architecture for actionable knowledge. Action units can also be granularly composed across operation classes, reflecting the cross-class character of real-world knowledge-driven processes. Conditional action units, operationalized as executable IF-THEN structures, enable knowledge graphs to function as graph-native decision-support systems, constituting a transition toward post-FAIR knowledge infrastructures. Applied to biodiversity science, the framework reinterprets documented intervention and epistemic failures as consequences of incomplete action unit structures and constructs worked examples across all three operation classes. We propose the TripleA Principle: Actionability, Applicability, and Auditability, as a guiding framework for next-generation knowledge infrastructure design extending the FAIR and CLEAR Principles.

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