The forward slash (`/`) constrains an attribute to
a starting point and an interval. It is used to specify every `N` seconds,
minutes, or hours within the minute, hour or day. For an expression of the
form `x/y`, `x` represents the starting
point and `y` represents the interval. The wildcard character
may be used in the `x` position of an interval, and is equivalent
to setting `x` to `0`.

Intervals may only be set for `second`, `minute`,
and `hour` attributes.

The following expression represents every 10 minutes within the hour:

minute="*/10"

It is equivalent to:

minute="0,10,20,30,40,50"

The following expression represents every two hours starting at noon:

hour="12/2"

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