Variables are typed. A variable of a certain type can only contain values of its defined type or subclasses of the type.
The existing values are closely related to CoreMedia CMS property types and resource objects:
Boolean
Blobs
Contents, Folders and Documents
Content types
Dates
Exceptions
Groups and Users
Integers
Strings
Timers
All values implement the java.lang.Comparable interface. They may contain
null values and are immutable. So, their setValue() methods must
never be called from your own code, the result of such an action is unpredictable.
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