def strip
      meta_vars, meta_values, meta_term = @meta.strip
      if meta_vars.empty?
        return [], [], self
      else
        return meta_vars, meta_values, Variable.new( meta_term )
      end
    end
def strip
      meta_vars, meta_values, meta_term = @meta.strip
      if meta_vars.empty?
        return [], [], self
      else
        return meta_vars, meta_values, Variable.new( meta_term )
      end
    end
Strip of all values

 Split up into variables, values, and a term where all values have been
 replaced with variables.

 @return [Array<Array,Node>] Returns an array of variables, an array of
 values, and the term based on variables.

 @private