Why are Data Table sentinel values needed?
Often Data Tables are incomplete for various reasons. Typically a set of special values is selected to flag missing data. Such special values are selected to be out of the valid range of values for the parameter in question. Since the valid range of a parameter varies by data set as well by Table_Property_Description type, these special values vary accordingly. Property Characteristics provide a means to associate specific sentinel values and their meaning with a specific Table Property Description of a specific Data Table.
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