[x3d-public] Sequencer interval definition

[Andreas Plesch]

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> http://www.web3d.org/x3d/content/X3dTooltips.html#Ranges
>
> Ranges may be defined to set lower and upper bounds on allowed attribute
> values. These are typically defined by the X3D specification in order to
> avoid illegal or illogical values. Range constraints are checked by schema
> validation tools (but not XML DTD). Example range values:
>
> *   [0,1] places limits on an allowed value from range 0 to 1, inclusive.
> *   (0,+∞) is positive, i.e. greater than zero and less than positive
> infinity.
> *   [-1,+∞) is greater than or equal to -1.
> *   (-∞,+∞) is unbounded, any numeric value is allowed.
> ========================================================


These example will help anybody who wants to dive in.
http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/utils.html#SequencingEvents
and the key field explanation at
http://www.web3d.org/x3d/content/X3dTooltips.html#IntegerSequencer refers
to 'intervals' rather than 'ranges'. Perhaps just linking the word
'intervals' in the key field explanation to the #Ranges section would be
enough of a hint.

-Andreas
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