2.1.1 Part 1 Section 2.2, Application Conformance

a.   The standard specifies that white space content in strings representing atomic data must be normalized as part of processing.

Office will only accept XML in which atomic content of attributes and elements is represented with white space content already normalized.

b.   The standard allows INF, NaN, and -INF as legal representations for double and float XML Schema types.

Office does not accept INF, NaN, and -INF as valid representations for double and float data.