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/usr/share/highlight/langDefs/fx.lang is in highlight-common 3.8-2.

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The actual contents of the file can be viewed below.

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Description="Java FX"

Keywords={
  {  Id=1,
   List={
"abstract", "after", "and", "as", "assert", "at", "attribute", "before", "bind",
"bound", "break", "catch", "class", "continue", "def", "delete", "else",
"exclusive", "extends", "false", "finally", "first", "for", "from", "function",
"if", "import", "indexof", "in", "init", "insert", "instanceof", "into",
"inverse", "last", "lazy", "mixin", "mod", "new", "not", "null", "on", "or",
"override", "package", "postinit", "private", "protected", "public-init",
"public", "public-read", "replace", "return", "reverse", "sizeof", "static",
"step", "super", "then", "this", "throw", "trigger", "true", "try", "tween",
"typeof", "var", "where", "while", "with"
        }
  },

  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

Strings = {
  Delimiter=[["|']]
}

Comments = {
   { Block=true,
     Nested=false,
     Delimiter = { [[\/\*]], [[\*\/]] }
   },
   {
     Block=false,
     Delimiter = { [[//]] }
   }
}

IgnoreCase=false

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\.|\:|\&|\<|\>|\!|\=|\/|\*|\%|\+|\-|\~|\|]]