I've already mentioned IVOA here a while ago. I've jumped since a few days in a lively debate on IVOA semantics forum, including this thread, where ontological status of observation, event, object, etc. are discussed in-depth. As already mentioned, definition, identification and classification of an unbound quantity of "objects", among the tremendous flow of data carried by all wavelenghts of light over distances ranging from a few kilometers to billions of light-years, and captured by so many instruments and stored in so many data bases ... is one of the widest, oldest and most fascinating challenges in Knowledge Management. Not to mention the task of making sense of all that stuff put together ...
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