2.1.1480 Part 1 Section 21.2.2.82, holeSize (Hole Size)
a. The standard states that the val attribute specifies that the contents of this attribute will contain a hole size between 10 and 90.
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In Office, the val attribute specifies that the contents of this attribute will contain a hole size as defined by the ST_HoleSize simple type.
b. The standard implies that the val attribute is optional.
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Office requires this attribute.