Crane has made publicly-available the tools that the UBL Schema Generation Task Group uses to create the UBL 2.1 artefacts.  Anyone can use these tools to create their own artefacts that conform to the Naming and Design Rules published by the committee.

This tool coverts one or more binary OpenOffice ODS files into a genericode file:

http://www.CraneSoftwrights.com/resources/ubl/index.htm#ods2ublgc

This tool converts a genericode file into a set of XSD schemas:

http://www.CraneSoftwrights.com/resources/ubl/index.htm#gc2ublndr

This tool converts a genericode file into the files needed to ZIP into an OpenOffice ODS file:

http://www.CraneSoftwrights.com/resources/ubl/index.htm#gc2odsxml

Please address any questions to info@CraneSoftwrights.com and I will be pleased to answer them.