2.1.575 Part 1 Section 18.2.27, workbook (Workbook)
a. The standard states that minOccurs for the bookViews element is zero.
Excel will fail to print files without a bookViews element.
b. The standard specifies that the conformance attribute is a valid attribute of the workbook element.
Excel ignores the conformance attribute.
This note applies to the following products: O14, O14 Server, O14 SP1.