hash table: An internal data structure that allows G2 to quickly locate, among many instances of a user-defined class, one or more items with an indexed attribute that contains a particular value. G2 automatically creates and maintains one hash table for each indexed attribute declared in any user-defined class in your KB.
heuristic knowledge: Knowledge that is based on experience or observation, but not necessarily verifiable.
hidden attributes: Attributes inherent within an item, but which are not visible in its attribute table. Hidden attributes include:
hierarchy of classes: An organization of classes into superior and subclasses to allow for inheritance of attributes and other knowledge. Each class inherits the attributes of its superior classes.
history: The past values of a variable or parameter. Each value is stored with the date and collection time.
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