2.1.808 Part 1 Section 18.11.1.7, oldFormula (Old Formula)
a. The standard states that the contents of this element are an extension on the ST_Formula simple type.
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Excel requires the contents of this element to follow the grammar for a name formula, as defined in Name Formulas (§3.2.3.1.4, Name Formulas).
b. The standard makes no mention of an xml:space attribute.
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Excel uses this attribute to specify, using the W3C space preservation rules, how white space should be handled for the element's contents; its allowed values are defined by the XML 1.0 specification.