[wg11] Update to EXPRESS/HDF5 Mapping - Region Reference Entity Instance IDs

[David Price]

All,

I've uploaded some updates to the EXPRESS/HDF5 mapping today at:

http://www.exff.org/express_binary

The most recent additions are examples of how to write entity instances that 
reference other entity instances using HDF5 Region References. The simple 
example I uploaded today includes working C code that handles:

ENTITY line;
start_point : point;
end_point : point;
END_ENTITY;

ENTITY point;
x,y,z : REAL;
END_ENTITY;

We were considering also including a tuple-of-integer approach to entity 
instance identifiers, but it was my understanding that there is not actually 
an integer identifier for each HDF5 dataset as would be required. I'll pursue 
that a bit more with the HDF5 Group but it may have to be removed from the 
document. A placeholder remains at the moment.

Cheers,
David

P.S. See

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