即时读取.tgz文件夹中的文件

I am trying to read in a set of .xml documents that are stored inside a .tgz directory on the fly. The structure of the .tgz file is a top level folder 01 with subdirectories A1,A2, etc, and in each of these Ax directories are a set of .xml documents that I wish to read. eg. 01/A1/1234.xmlI am trying to read in a set of .xml documents