Amendment 1 to ITU-T Rec. X.694 | ISO/IEC 8825-5 adds the specification of Version 2 of the mapping from XSD into ASN.1. The Version 2 mapping is more efficient in two main areas: the ASN.1 time types are used rather than VisibleString for mappings of dates and times; the Fast Infoset specification (ITU-T Rec. X.891 | ISO/IEC 24824-1) is used for the mapping of XSD wild-cards. Both these changes to the mapping provide much more compact binary encodings for the XML specified by the XSD.

This amendment also includes editorial clarifications, and corrections to a number of defects that were identified. Both these changes apply to both Version 1 and Version 2.