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This service assumes prior knowledge of the existence of
adjacent tiles of a framework data layer, and an ability to
access copies of those adjacent tiles. This service applies
to CGDI framework data that meets the standard specifications.
Framework data layers are defined in the CGDI
Framework Data Definition. This service is not a heartbeat
service, but it is a high-availability service. It will not
be accessed by most clients or users of the infrastructure,
but rather by a select few organizations that provide regional
or national snapshots of framework datasets for the general
users of the CGDI framework datasets.
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