Datatype Conversion Overflow Document

Hi all,
    We've thought about the changes to the overflow document and are leaning
toward taking out the "fill value" parameter from the callback, since it can
be easily set up by an application (or the netCDF library) as part of the
"user_data" information for the callback.  With this revision, the overflow
callback is more general purpose and less tailored to just the netCDF needs.
Let me know what you think.

    Quincey

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The revised document is posted at

http://hdf.ncsa.uiuc.edu/RFC/dtype_conv_overflow/Overflow.html


The only major change is about fill value, which is no longer a parameter 
of the callback function.  User can retrieve it easily themselves from the 
dataset property transfer property list.

Ray

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