The NAACCR XML Data Exchange Standard Implementation Guide Version 1.4 is posted to the NAACCR website: https://www.naaccr.org/xml-data-exchange-standard/.
For the changes in version 1.4, please see section 3.4 Changes introduced in version 1.4 and section 6 Document History.
Thanks
Lori
Lori A. Havener, CTR
Program Manager of Standards
NAACCR