Xmill: an Eecient Compressor for Xml Data

We describe a tool for compressing XML data, with applications in data exchange and archiving, which usually achieves about twice the compression ratio of gzip at roughly the same speed. The compressor, called XMill, incorporates and combines existing compressors in order to apply them to heterogeneous XML data: it uses zlib, the library function for gzip, a collection of datatype speciic compressors for simple data types, and, possibly, user deened compressors for application speciic data types.