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SDSI syntax

Bob Jueneman notes that large files (e.g. photos) and other documents may
be common, as part of the discussion on canonicalization.

As I noted in an earlier message, it is easy to adjust the canonicalization
procedure of SDSI to make it one-pass even for documents larger than your
computer's memory.  We can use the SDSI fragmentation process, so that
a large document is represented as a series of short (e.g. 4096 byte) fragments
followed by one partial fragment:
Here there are 4096 (hex 1000) a's, b's, and c's.  So the length of the
entire file does not need to be known ahead of time...