On get each bit indicates whether the corresponding attribute is
configured or unconfigured:
0 = The attribute is configured (i.e. the configured value is the
operational value).
1 = The attribute is unconfigured (i.e. the operational value is
inherited from the a higher level which could be the default
value).
Getting the attribute value itself always returns the operational value
of that attribute regardless of whether the attribute is configured or
unconfigured.
On write each bit indicates wheter or not the corresponding attribute
should be set to the unconfigured state:
0 = No operation (i.e. do not change the state of the attribute).
1 = Set the attribute to the unconfigured state.
Setting an attribute to a value has the automatic side-effect of setting
the bit with the same name to zero.