Usage

gistfile1.rb

class MaterialConsumption
  include MultidimensionalTable

  dimensions  :year => [:year_1994, :year_1995],
              :city => [:buenos_aires],
              :material => [:coal, :potassium]

  table_data do
    year_1994 do
      buenos_aires do
        coal '8t' 
        potassium '5t' 
      end
    end

    year_1995 do
      buenos_aires do
        coal '8t' 
        potassium '6t' 
      end
    end
  end

end

mt = new MaterialConsumption
mt.update_attributes(:year => :year_1994, :city => :buenos_aires, :material => :coal)
mt.table_result #=> '8t'

This is usage. Kinda like Ruby DSL to describe multidimensional table. I got it to work but in the process I had trouble with keeping the current context for the rules. So I reimplemented stack (that's how it feels)