|Visio XML Reference|
Specifies the percentage of magnification of the drawing page on the printer page, in the x (horizontal) direction.
Optional string. Represents a unit of measure. The default is PER. For details about PER, see Units of measure.
Optional string. Represents the element's formula. This attribute can contain one of the following strings: "someFormula" if the formula exists locally, "No Formula" if the formula is locally deleted or blocked, or "Inh" if the formula is inherited.
If the attribute is not present, the element's formula is a simple constant. For example, <element>5</element>.
Optional string. Indicates that the formula evaluates to an error. The value of Err is the current value (an error message string); the value of the element is the last valid value.
This value is used only when the OnPage element value is FALSE. The ScaleX element always has the same value as the ScaleY element, and corresponds to the value in the Adjust to setting on the Print Setup tab in the Page Setup dialog box (File menu).
ScaleX cell (Print Properties section)