Fidelity

As the example in the previous section illustrates, the data accessed
by an Odyssey application may be stored in one or more gcncralpurpose
repositories such as file servers, SQL servers, or Web
servers. Alternatively, it may be stored in more specialized rcposltories
such as video libraries, query-by-image-content databases, or
back ends of geographical information systems.
The constraints of mobility complicate data access from such
servers. Ideally, a data item available on a mobile client should be
indistinguishable from that available to the accessing application if
it were to be executed on the server storing that item. But this corrcspondencemay
be difficult to preserve as resources become scarce;