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Pattern based restriction of the arraySizeBase list type. Used
as the type of the arraySize attribute. Restricts asterisk ( * )
to first list item only. Instances must contain at least an
asterisk ( * ) or a nonNegativeInteger. May contain other
nonNegativeIntegers as subsequent list items.
Valid instances include;
*
1
* 2
2 2
* 2 0
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