2.1.1725 Part 1 Section 22.4.2.1, array (Array)

a.   The standard states that the values of the lbound attribute are defined by the XML Schema int datatype.

Office defines the values of this attribute to be a collection in the format #, #, # ... #, where each # represents an integer and the attribute’s value matches the regular expression pattern \s*[\+\-]?[0-9]+\s*(\,\s*[\+\-]?[0-9]+\s*)*.

b.   The standard states that the values of the ubound attribute are defined by the XML Schema int datatype.

Office defines the values of this attribute to be a collection in the format #, #, # ... #, where each # represents an integer and the attribute’s value matches the regular expression pattern \s*[\+\-]?[0-9]+\s*(\,\s*[\+\-]?[0-9]+\s*)*.