New:
The different folders (1.0, 2.0, 1.10, ...) correspond to different validation levels that may apply to different sets of data.
Downloadable here :
https://x-englishwordnet.github.io/schemas/1.1/EWN-LMF-1.1.xsd
https://x-englishwordnet.github.io/schemas/1.1/EWN-LMF-1.1-relax_idrefs.xsd
https://x-englishwordnet.github.io/schemas/1.1/EWN-LMF-1.1b.xsd
https://x-englishwordnet.github.io/schemas/1.1/EWN-LMF-1.1b-relax_idrefs.xsd
https://x-englishwordnet.github.io/schemas/1.10/xEWN-LMF-1.10.xsd
https://x-englishwordnet.github.io/schemas/1.10/xEWN-LMF-1.10-relax_idrefs.xsd
https://x-englishwordnet.github.io/schemas/2.0/EWN-LMF-2.0.xsd
https://x-englishwordnet.github.io/schemas/2.0/EWN-LMF-2.0-relax_idrefs.xsd