Cause: The XSD schemas released by NIST and shipped within OpenSCAP project did only allowed for OVAL versions in form of X.Y. While the latest release of OVAL language 5.11.1 is in form of X.Y.Z
Some OpenSCAP commands, like DataStream compose (oscap ds sds-compose) were not working for content of the latest OVAL version.
Fix: XSD schema incorporated in OpenSCAP project has been amended to allow for all known OVAL versions.
All OpenSCAP operations work well with latest OVAL content.