2.1.639 Part 4 Section 220.127.116.11, customSheetView (Custom Sheet View)
a. The standard says scale attribute defines the print scale.
Office uses the scale attribute to define the zoom level.
b. The standard states that the values of the colorId attribute are defined by the XML Schema unsignedInt datatype.
Office restricts the colorId attribute value to an unsignedInt less than or equal to 64.
c. The standard specifies @scale ranges from 10 to 400.
Excel also allow for a value of zero, which is interpreted as the automatic setting.
d. The standard specifies that colorId attribute defines the color value for text in row or column headings and gridlines the custom view.
Office uses colorId attribute to define the color value for gridlines in the custom view.
e. The standard specifies that possible values for the guid attribute are defined by ST_Guid simple type.
Office requires the guid attribute to be a non-null guid (a null guid is defined as 00000000-0000-0000-0000-000000000000).