Issue confirmed, reported to developers, thank you for the report.

Hi chat, I have published a GDTF Editor VSCode extension, https://marketplace.visualstudio.com/items?itemName=dmxout-hippyau.vscode-gdtf It does not do everything, but if you have xmllint installed, it will validate the xml against the GDTF 1.2 schema, and show problems. It provides an "Outline" section too, and shows wheel images, and colour swatches. Issues and PR's are welcome... https://github.com/hippyau/vscode-gdtf-editor Cheers, Hippy