nexml is an xml format that represents phylogenetic data (trees, character sequence alignments, sets of OTUs, substitution models). The format is inspired by the commonly used flat-file NEXUS format, but more robust and easier to process.
Tpl makes it easy to serialize your C data using just a handful of API functions. The data is stored in its native binary form for maximum efficiency. C, Perl and XML supported. Data is portable across CPU types and OS's from Unix to Mac to Windows.