XSD 1.1

[dalcorta]

The fix repository specifies many conditional values, this can be added to the xsd through the assert tag. To do this the schema needs to be XSD 1.1.

What are the possibilities of this happening?

[donmendelson]

XSD assert was considered for other FIX standards, including Orchestra and SBE. Unfortunately, support for XSD 1.1 is poor across many programming language tools, especially those that are free or open source.

[dalcorta]

For complete support of XSD 1.1 there is this python library https://pypi.org/project/xmlschema/ using MIT license and for JAVA there is Apache Xerces that uses Apache License.
For .Net there is a way around the problem using IKVM project -> https://stackoverflow.com/questions/61293382/xsd-1-1-validation-for-both-java-and-net-c that allows using Apache Xerces in .Net

[dalcorta]

There is also a paid Saxon EE for XSD 1.1