Complexity and interoperability must be clarified. The fourth group looked at crosswalks which can be used for either indexing and retrieval or for data transfer. An effective crosswalk can provide a desired level of transparency for the user. That is, the user can present a request in his or her home language, crosswalks can enable searching a variety of places, and provide a response in the home language. Some categories will improve with tightening definitions.
Evaluation is necessary.
Weibel described a German preprint medical database as one of the best DC applications to date. A task group was established to write a position paper for Helsinki regarding categories like date, object, source, coverage, and relation which are of special importance to the cultural heritage community. DC is not a substitute for a community's database structure.