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Part III. Appendix 2: Data TransportAnother group, on the other hand, includes services that might fruitfully reside in the minimalserver, and if they were encoded in something like a plug-in module, they could be updated readily.Some of these services could reduce the amount of data to be transmitted:• averaging• summingand others might be part of an effort to establish a certain degree of semantic consistency in thesystem’s traffic:• Scaling of values such that they are delivered in a consistent system of units; e.g., mks or cgs• Conversion of time from varied representations• Conversion of Earth coordinate systems• Conversion of measurement units• Conversion of missing values(This latter group of services should probably be transparent to the user requesting the data.)158