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The tractability of the lightweight description logic EL has allowed for theconstruction of large and widely used ontologies that support semanticinteroperability. However, comprehensive domains with a broad user base areoften at odds with strong axiomatisations otherwise useful for inferencing,since these are usually context-dependent and subject to divergingperspectives. In this paper we introduce Standpoint EL, a multi-modal extensionof EL that allows for the integrated representation of domain knowledgerelative to diverse, possibly conflicting standpoints (or contexts), which canbe hierarchically organised and put in relation to each other. We establishthat Standpoint EL still exhibits EL's favourable PTime standard reasoning,whereas introducing additional features like empty standpoints, rigid roles,and nominals makes standard reasoning tasks intractable.

Tractable Diversity: Scalable Multiperspective Ontology Management via Standpoint EL