Updates for new tagging API.  Updates based on reviewer feedback.  More use of docbook callouts.  Fixed bug in parameter checking in tag/sequential.py  Refer to other sources of information re API in the appendix.  Doctest fixes.
Updates for new tagging API.  Updates based on reviewer feedback.  More use of docbook callouts.  Fixed bug in parameter checking in tag/sequential.py  Refer to other sources of information re API in the appendix.  Doctest fixes.



svn/trunk@7560

nltk/nltk,nltk/nltk,nltk/nltk