For some background information, motivation and a basic usage sample see this blog post.

To install libxml2 for development, do:

$ sudo apt-get install libxml2 libxml2-dev

Or build from source. You would need it installed to use gosax.

gosax's code is in the public domain (see LICENSE for details). It uses libxml, which has its own (MIT) license.

The pointer directory vendors https://github.com/mattn/go-pointer/ with some modifications. go-pointer has an MIT license, which applies to my version too.