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I have changed the mime type for .xjb files under Tools/Options/Miscellaneous/Files to application/xml but the editor does not highlight the syntax
Changing the mime type for xjb files to "text/xml-external-parsed-entity" fixed this issue for me using NB 6.9.1
+1 xjb files are quite common and should be supported by default.
Will add .xjb => text/x-jaxb-bindings+xml to default to XML highlighting & actions.
Fixed in jet-main #4e1bd85657ce