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Part III. Appendix 2: Data TransportThe modular approach will allow the IOOS Data Transport System to be implemented in well-defined,manageable pieces, while at the same time providing desirable flexibility in the functionalityand use of the system. It also provides a clean mechanism for extending functionality by layeringmodules on top of those already defined, for example, adding data reprojection.In summary, IOOS must:• Support format translation from the format in which the data are stored to that of the clientprogram,• Support delivery of data of a given data type in a structurally consistent form,• Provide the metadata needed to transform the data to a consistent semantic form or deliver thedata in a consistent semantic form,• Provide the capability to access metadata from a location different from the data server, and• Provide a capability to access metadata in a variety of forms, i.e., IOOS must not be confined tousing a single semantic data model.147