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+The XAR project aims to provide an easily extensible archive format. Important
+design decisions include an easily extensible XML table of contents for random
+access to archived files, storing the toc at the beginning of the archive to
+allow for efficient handling of streamed archives, the ability to handle files
+of arbitrarily large sizes, the ability to choose independent encodings for
+individual files in the archive, the ability to store checksums for individual
+files in both compressed and uncompressed form, and the ability to query the
+table of content's rich meta-data.