# File lib/numru/nusdas.rb, line 326
    def var(element)
      unless String === element
        raise "vname must be String"
      end
      if /^(.*)#{@@surf_suffix}$/ =~ element
        element = $1
        surf = true
      else
        surf = false
      end
      element = element.ljust(6)
      if @meta[:elements].include?(element)
        return NuSDaSVar._new(element,@meta,self,surf)
      else
        raise "variable '#{element}' is not found"
      end
    end