'''

feed parser. 
python library that read almost all rss versions and atom.
doclang is not a good solution for feed parsing. too much data
but couchdb can hold rss feeds easily.
nothing prevent an agent to fetch and store article into a couchdb
one of more document can hold list of url feed.
then the agent will fetch and save new document containing article as attachment
then i will have my newspaper history database

and doclang
some method can be created (subscribe,unsubcribe)
and it could act as a webhook

'''