# File lib/ruote/exp/ro_attributes.rb, line 95
    def lookup_val_prefix (prefix, att_options={})

      lval(
        [ prefix ] + [ 'val', 'value' ].map { |s| "#{prefix}_#{s}" },
        %w[ v var variable ].map { |s| "#{prefix}_#{s}" },
        %w[ f fld field ].map { |s| "#{prefix}_#{s}" },
        att_options)
    end