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EMODnet is intended to advertise all data in the European Marine Domain as Open Data. It can however be quite a challenge to find and use the data as intended. Find more here for a complete example of a use case where EMODnet metadata search facilities and OGC services are used to work out the use case.
More information can be retrieve via Giorgio Santinelli, Willem Stolte, Martlin Verlaan and Gerrit Hendriksen