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Determine variable length storage requirements


size = H5D.vlen_get_buf_size(dataset_id,type_id,space_id)


size = H5D.vlen_get_buf_size(dataset_id,type_id,space_id) determines the number of bytes required to store the VL data from the dataset, using the space_id for the selection in the dataset on disk and the type_id for the memory representation of the VL data in memory.