id	domain	url
dad-10680	creativecommons.org	http://creativecommons.org/licenses/by/3.0/)
dad-10680	www.isi.edu	http://www.isi.edu/~marcu/discourse/tagging-ref-manual.pdf
dad-10680	www.lotpublications.nl	http://www.lotpublications.nl/documents/110_fulltext.pdf
dad-10680	homepages.inf.ed.ac.uk	http://homepages.inf.ed.ac.uk/jmoore/papers/rda-instr.ps
dad-10680	www.seas.upenn.edu	http://www.seas.upenn.edu/~pdtb/pdtbapi/pdtb-annotation-manual.pdf