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/usr/share/highlight/langDefs/mxml.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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Description="Magic eXtensible Markup Language"

Keywords={
  { Id=1,
    Regex=[[<[!?]?(?!\-\-)\/?[\w\:\-]+>?|[/?]?>]],
    Group=0,
  },
  { Id=2,
    Regex=[[([-\w]+)="]],
  },
  { Id=4,
    Regex=[[\&\#?\w+;]],
  },
}

Strings={
  Delimiter=[["]],
}

Comments={

  { Block=true,
    Nested=false,
    Delimiter= { [[\<\!\-\-]],[[\-\-\>]],}
  }
}

NestedSections = {
  { Lang="actionscript", Delimiter= { [[ <!\[CDATA\[ ]], [[ \]\]\> ]] } },
  { Lang="css", Delimiter= { [[<mx\:Style>]], [[<\/mx\:Style>]] } }

}

IgnoreCase=true