The change ID for querying the host specification data updated in a
time period. It has a format of timestamp:change_number, where
timestamp is the decimal string of a start time, and change_number is
the decimal string of an auto incremented variable counting from the
Time at which the host specification was created.
The host that the spec data belongs to.
Time at which the host specification was last modified. If it isn't set,
it is the same as
The collection of the host sub specifications. It is optional.
Properties inherited from DynamicData