Retrieving and composing individuals' capabilities are mentioned in many different research fields, like competence-based management, enterprise knowledge management systems, knowledge representation theory and so on. This work focuses on capability representation, discovery and composition in heterogeneous knowledge representation environments which is a framework for heterogeneous knowledge management systems. We define a capability representation language in Description Logics, and we propose approaches and algorithms for capability management and discovery, as we outline how our proposals are implemented in a mediator-based prototype system.