What does "-" means in this declaration

I was looking at this source code and in the attributes declaration there is a minus sign.

- s : String 

Or in a met开发者_开发百科hod declaration:

- x( aPoint : Point ):Integer {
     ad : Double = aPoint.getX()
     ad.intValue()
  }

What does it stands for?

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It makes the definition private, according to the access modifiers list.

http://code.google.com/p/ryz/wiki/RyzLanguageReference#Methods

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means s or x aren't static members, if you put + that means they are static ones

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From here, minus signs denote instance methods.