The described new URNs e.g.
<html
xmlns:faces="jakarta.faces"
xmlns:ui="jakarta.faces.facelets"
xmlns:f="jakarta.faces.core"
xmlns:h="jakarta.faces.html"
xmlns:pt="jakarta.faces.passthrough"
xmlns:cc="jakarta.faces.composite"
xmlns:yourCompositeComponents="jakarta.faces.component/libraryname"
xmlns:yourFacesComponents="jakarta.faces.component"
xmlns:c="jakarta.tags.core"
xmlns:fn="jakarta.tags.functions">
...
</html>
(see What's new in Faces 4.0?) are not working with auto completion (Ctrl + Space) in Eclipse 4.28 and JBoos-Tools 4.28.0.Final. How to make it working?