A map can concentrate a very complex content on little space e.g. a piece of paper. It helps to use both sides of your brain: the logical side and also your creative side (e.g. by using pictures, colors and keywords in a map, so called anchors). It is a technique to organize the way you think: It can help you by developing, sorting and memorizing your thoughts. Because you just use keywords and drawings, it is much faster than good old fashioned notes. Your brain memorizes things by associating them to other things -- a map makes use of those connections and stimulates new asccociations.
The latest versions of libxslt can be found on the xmlsoft.org server. (NOTE that you need the libxml2 , libxml2-devel , libxslt and libxslt-devel packages installed to compile applications using libxslt.) Igor Zlatkovic is now the maintainer of the Windows port, he provides binaries . CSW provides Solaris binaries , and Steve Ball provides Mac Os X binaries .
Libxml is a XML processor written by Daniel Veillard for the GNOME project... yea, that is the official statement, but he wrote it for fun, whatever he says :-). It implements a whole lot of existing standards related to markup languages and a few extras as well. Used together with its close friends libxslt, xmlsec and gdome, it forms a full-featured general-purpose toolkit for XML.