2.1.703 Part 1 Section 18.8.18, family (Font Family)
a. The standard states that the values of the val attribute are defined by the XML Schema int datatype.
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Excel restricts the value of this attribute to be at least 0 and at most 5.
b. The standard implies that the val attribute refers to character set.
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In Office, the val attribute is interpreted as referring to the font family.