I recently became obsessed with annotation graphs and linguistic graphs in general. Since September I am working with the graf-python library that implements the ISO 24612 - Linguistic annotation framework (LAF) standard. I planned to publish the corpora of our research center in an XML format that is easy to use, that is somehow officially recognized and that allows stand-off annotations so that I can share data and sets of annotations independently. GrAF/XML looked like an optimal solution, so I gave it a try.
Published at http://bl.ocks.org/4250342