[repository schema] Missing AppInfo FIXML schema (for EP272 and higher Orchestra XMLs)

[erakadjiev]

Starting from the FIX Latest EP272 Orchestra XML, AppInfo elements with FIXML information are included. For example, this FIXMLencodingType tag:

The XSD corresponding to the http://fixprotocol.io/2022/orchestra/appinfo/fixml namespace is not included in repository/src/main/resources/xsd/, thus generated Java bindings are not available for those elements. When the XML is unmarshalled, those FIXML tags are represented by generic com.sun.org.apache.xerces.internal.dom.ElementNSImpl objects. Those objects lead to various issues during later processing of the document.

It would be good to include the FIXML-related XSD as well, so that Java bindings are generated for it. This would also require publishing a new Maven module (version 1.7.4).

[donmendelson]

The AppInfo element was intended for application-specific extensions, and firms are free to create their own. For convenience, I suggest that the fixml schema (and any others published by FIX) be published with a note that it is informative, not normative for Orchestra.

[erakadjiev]

I think we should reject this issue, because the FIXML AppInfo elements shouldn't be considered a part of the Orchestra Repository and thus we shouldn't include the FIXML AppInfo XSD with the other Orchestra Repository XSDs.

By the way, is the XSD for the FIXML AppInfo elements (http://fixprotocol.io/2022/orchestra/appinfo/fixml) available somewhere? I think having it would be sufficient to make working with those elements a bit more convenient.