rpmdiff is a utility to create a binary patch from one version of an rpm to another. This binary patch can then be distributed to end-users of a distribution who have installed the first version of the rpm and they will be upgraded to the second version.
Binary XML is java library.
Major feature of library is document encoder/decoder which
helps to store DOM model in binary format and retrive DOM
model back. Encoded file size extremely small (in about 10
times relatively to original) .