def version_name(lang=nil)
      vername = @doc.root.attributes['versionName']
      unless @rsc.nil?
        if /^@(\w+\/\w+)|(0x[0-9a-fA-F]{8})$/ =~ vername
          opts = {}
          opts[:lang] = lang unless lang.nil?
          vername = @rsc.find(vername, opts)
        end
      end
      vername
    end
def version_name(lang=nil)
      vername = @doc.root.attributes['versionName']
      unless @rsc.nil?
        if /^@(\w+\/\w+)|(0x[0-9a-fA-F]{8})$/ =~ vername
          opts = {}
          opts[:lang] = lang unless lang.nil?
          vername = @rsc.find(vername, opts)
        end
      end
      vername
    end
application version name
 @return [String]