The following typos have been observed: - 'types orginally defined' should be 'types originally defined' - 'openEHR specifcations to exist' should be 'openEHR specifications to exist' - 'built in to a type system' should be 'built into a type system' - 'for exmaple' should be ' for example' - 'subsitutability' should be 'substitutability' - 'This deviation is also appears to be used' should be 'This deviation also appears to be used' Markup error in section 9 for Iso8601_Time (see attachment)