H5VL_REGISTER_CONNECTOR_BY_VALUE registers a new VOL connector with value
connector_value as a member of the virtual object layer class. This VOL connector identifier is good until the library is closed or the connector is unregistered.
Valid VOL connector identifiers can have values from 0 through 255 for connectors defined by the HDF5 library. Values 256 through 511 are available for testing new filters. Subsequent values should be obtained from by contacting the The HDF Help Desk.