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While MINC specifies the structure and interpretation of a number of
objects, MINC programs must operate gracefully with MINC files
that contain non-standard constructs. This imposes two requirements
on MINC programs. First, MINC programs must operate correctly on
files which contain non-standard variables and attributes. Second,
MINC programs must copy non-standard attributes and variables from the
input file to the resulting output file without alteration.
This behavior allows the addition of arbitrary variables and/or
attributes that extend the standard MINC namespace. As one small
example, this has proven useful in database applications where a
digital signature is added to the MINC file to provide a redundancy
check on the data.
It is strongly recommended that any additional or non-standard
informational attributes be placed under the ``info'' branch of
the hierarchy. Specific programming interfaces exist to support this
convention.
Robert VINCENT
2005-05-10