IntervalLink

The IntervalLink is a Link type used to specify numeric intervals. It would serve as the base type for TimeIntervalLink.

A typical usage might be:

 IntervalLink
    NumberNode 2.0
    NumberNode 3.0

which specifies the numeric interval between two and three. An unbounded-above interval can be specified with a negative upper bound:

 IntervalLink
    NumberNode 2.0
    NumberNode -1.0

indicates the interval "two or more".

It is intended for use with the typing of the GlobNode, and with the specification of list lengths, in the TypeSetLink.

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