Convert a to xpi

What is the difference between .a and .xpi?

Description: A Static Library, typically denoted by the file extensions `.a` on Unix-like systems or `.lib` on Windows, is a collection of compiled object code modules that are linked into applications during the build process, rather than being loaded dynamically at runtime. This type of library contains a set of routines, external functions and variables, which are resolved and incorporated into the final executable file by a linker.; Efficient XML Interchange (EXI) is a binary XML format for exchange of data on a computer network. It was developed by the W3C's Efficient Extensible Interchange Working Group and is one of the most prominent efforts to encode XML documents in a binary data format, rather than plain text. Using EXI format reduces the verbosity of XML documents as well as the cost of parsing. Improvements in the performance of writing (generating) content depends on the speed of the medium being written to, the methods and quality of actual implementations.