DateTime property type should get a resolution attribute

Cmis offers a property type DateTime. Many databases (and with that many repositories) have different types for Date and DateTime. Most repositories will map both to cmis:DateTime. Howver a client creating a DateTime value has no information about the actual implementation in the repository. So setting a time value in a property that is actually mapped to date in the repository might result in data loss when the property is read again. This can be crtical. To introduce a "resolution" attribute in a type definition would be beneneficial in this case to indicate a client what he can expect (comparable to precision in Integers, etc.).