def add_attribute(node, key, name, value)
      node[:attributes!] ||= {}
      node[:attributes!][key] ||= {}
      if node[:attributes!][key].include?(name)
        node[:attributes!][key][name] = arrayize(node[:attributes!][key][name])
        node[:attributes!][key][name] << value
      else
        node[:attributes!][key][name] = value
      end
    end
def add_attribute(node, key, name, value)
      node[:attributes!] ||= {}
      node[:attributes!][key] ||= {}
      if node[:attributes!][key].include?(name)
        node[:attributes!][key][name] = arrayize(node[:attributes!][key][name])
        node[:attributes!][key][name] << value
      else
        node[:attributes!][key][name] = value
      end
    end
Adds Savon attribute for given node, key, name and value.