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Picxml is a tool for xml files management. Used as command: Picxml is a shell friendly, xpath like query tool. Used as library: picxml, is a full featured xml Parser, wich allows you to navigate, find/create/update/delete/print nodes.
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.