2.1.1605 Part 1 Section 21.3.2.12, graphicFrame (Graphic Frame)
a. The standard allows a graphicFrame to be specified within a Chart Drawing.
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Office does not support the display of graphic frames inside charts.
b. 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.