Load (instantiate) an object of type T from the information in an HDF5 file. The IO metadata present in the file, as well as the file and group with the file, are provided as arguments, so that implementations can read additional data that might be required for correct object instantiation.

Save all required information about an object to an HDF5 file, so that the object can later be reconstructed using the Hdf5IOHandler.load method. Note that implementations do not need to care about saving the object's IO metadata, as this is taken care of by the framework. Thus, if the object to be stored does not require any further parameterization, this method does not need to be overridden (there is a default no-op implementation). Otherwise, it is strongly advised to follow these rules in the implementation:

- Do not write data anywhere except in the provided group (or subgroups thereof). In other words, do not store data in parent of sibling groups of h5Group. - Do not store attributes directly attached to h5Group, as they might clash with the attributes used internally by the framework. - There are no further limitations, i.e., you are free to create values and subgroups, or anything else, in h5Grouph5Group itself.