Denotes one policy tag in a taxonomy (e.g. ssn). Policy Tags can be
defined in a hierarchy. For example, consider the following hierachy:
Geolocation | ------------------------------------ | | | LatLong
City ZipCode PolicyTag "Geolocation" contains three child policy tags:
"LatLong", "City", and "ZipCode".
Required. Human readable name of this policy tag. Max 200
bytes when encoded in UTF-8.
Resource name of the parent policy tag to this policy tag
(e.g. for policy tag "LatLong" in the example above, this
field contains the resource name of policy tag "Geolocation").
If empty, it means this policy tag is a top level policy tag
(e.g. this field is empty for policy tag "Geolocation" in the
example above). If not set, defaults to an empty string.
