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This requirement may be lifted in the context of usage data since currently there is no direct use for this format itself. Nevertheless it is strongly recommended to implement it anyway to comply with the requirements for a standards compatible OAI-PMH interface. It is advisable to offer the data at least as a rudimentary DC data set (identifier and description) which should describe the data offered and linked to by a certain identifier (see above regarding the identifier discussion). For creating a DC data set, follow the DRIVER guidelines. Example Warning: the XML excerpts given in these guidelines as illustrations do not necessarily contain all details regarding XML namespaces and XML schema. Nevertheless this omitted information is to be included in actual implementations and must not be considered optional.
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