Data Center Markup Language (DCML) is a data oriented approach to solve the problem of large scale systems management, particularly in a data center environment. DCML stitches together multiple management systems and tools to form a unified management view of the environment. In this unified view, management systems can exchange domain knowledge about the environment with other management systems in the same environment. A common data oriented approach is the first step toward a unified management view of the environment. With a data oriented approach, systems communicate by importing and exporting data in vocabularies of a well known language - DCML.
RDF/OWL-based. I've only skimmed the spec (very readable PDF,
registration required), but it looks to be a nice application of
ontological modelling to a practical app - describing server