たとえばこういう XML があったとして、 <status><created_at>Mon Feb 06 21:07:52 +0000 2012</created_at><id>166629198054690816</id><text>Post-Bowl Twitter analysis http://t.co/OYYSRSew http://t.co/M0AtLQVd</text><source>web</source><truncated>false</truncated><favorited>false</favorited><in_reply_to_status_id></in_reply_to_status_id><in_reply_to_user_id></in_reply_to_user_id><in_reply_to_screen_name></in_reply_to_sc
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