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trexio/Sparse.org

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See templator_front.org
* Text back end
As the size of the dataset should be extensible, the simplest
solution is to use one file for each sparse data set, and store a
the name of this file in the group.
Each integral can be a line in the file:
i j k l x
which can be read with "%10ld %10ld %10ld %10ld %24.16e".
The offset can be used with ~fseek(69L*offset, SEEK_SET)~
* HDF5 Back end
We need to declare the number of rows of the dataset as ~UNLIMITED~. This requires to use the ~Chunked~ storage, and the
chunks should absolutely not be larger than 1MB.
To extend the storage, see :
https://support.hdfgroup.org/HDF5/doc1.6/UG/10_Datasets.html
(figure 17)
If the offset+num > nmax, we need to extend the dataset.