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Description of general behavior....
Note that there was some initial confusion
which is reflected in this diagram.
I should emphasize that the gateway may
actively solicit the NSDL servers for whether
there be content changes (assumingly to trust
the metadata as opposed to download and checksum
content) and pass this information onto the
LON-CAPA servers.  The Gateway Server is NOT a central
repository for downloaded content from NSDL.
It merely negotiates the transaction by which
NSDL content is transferred to and delivered
by a LON-CAPA server in an educational context.