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This was seemingly used to generate C headers with wayland-scanner like ```c ORG_KDE_PLASMA_WINDOW_MANAGEMENT_STATE_KEEP_BELOW = 1 << 5, ``` However, this is suboptimal because 1) It's harder to parse the XML for concrete enum values unless you attempt to generate the code in a specific way. For instance, https://docs.rs/wayland-scanner/ does it differently, hence it had to skip this XML. 2) Some languages like Haskell don't even have "<<" as a bitshift operator, so it would be even more obscure for them.
