xz is a lossless data compression program and file format which incorporates the LZMA/LZMA2 compression algorithms. One can think of xz as a stripped-down version of the 7-Zip program. xz has its own file format rather than the .7z format used by 7-Zip (which lacks support for Unix-like file system metadata).
In general, an ePortfolio is a purposeful collection of information and digital artifacts that demonstrates development or evidences learning outcomes, skills or competencies.
The above definition was designed to be as inclusive as possible, based on the diverse 'ePortfolio community'. Here is how it was arrived at! 1. There is no Universal definition in the mature paper-based portfolio literature: reflecting diverse purposes; different educational philosophies and practices. We should therefore not be surprised that there is no one single definition of 'ePortfolio'.