2.1.1609 Part 1 Section 21.3.2.22, sp (Shape)
a. The standard states that textlink is a formula linking to spreadsheet cell data.
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Excel requires that the value of the textlink attribute be a string referencing a cell or a cell range. This reference should be to a unique cell. Excel accepts a cell range but only considers the first cell in the range.
b. The standard states that that the minOccurs of child element txBody is 0.
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Office requires txBody if textlink is specified. Chart drawing content will not load if txBody is not provided and textlink is valid.
c. The standard allows attribute fLocksText on a shape in a chart drawing.
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Office does not support attribute fLocksText on a shape within a chart drawing.
d. The standard states that the values of the macro attribute are defined by the XML Schema string datatype.
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Office requires that the macro attribute value follow the same grammar as name-references ("[ISO/IEC-29500-1] §18.17.2.5") with a minimum length of 0 characters and a maximum length of 256 characters.