This display element is used to display a number on the screen
and/or get a number entered by the user (compare with
Text Input Field and
Date Input Field).
Note that this display element should be used only when the user
is allowed to change the displayed number interactively.
If the user should not be able to edit the displayed number ("read only" mode), use
<Value> (non-repetitive number element): The displayed/entered number.
Access it (to set its initial value or to retrieve the number that has been
entered by the user) through a reference to the parent Number Input Field element
or to a higher level display element containing it.
You may add an action sub-model named
<On Change> to model what should be done when the user enters
a new number. If you don't, nothing is done until another user action
causes some action to be performed (e.g. pressing a
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