User Session Derived Schema for WWW service This is a derived schema for the WWW service which represents user session. User sessions tracks the traversal of users through the web site. Users are tracked using their IP address and their user agent information. This is not a full proof method. For one thing, it clearly fails in the case of users having an homogeneous environment and browsing from behing a proxy server. Possible enhancements would be to use tracking information from a cookie. The session represent all the consequential requests made by a user. The session will end after 30 minutes where no requests was made by the user. This field contains an arbitrary session identifier. The time at which the session started. The time of the last request in the session. The length elapsed between the first and last requests. The number of pages requested by the user in this session. (This excludes requests ending in .png, .jpg, .jpeg, .gif and .css.) This gives the number of requests by the user The first page requested by the user. (See page_count for exlusion.) The 2nd page requested by the user. The 3rd page requested by the user. The 4th page requested by the user. The 5th page requested by the user. The last page requested by the user. Was this session completed? A completed session is one that we know for sure that if the user made another request, it would have been in a new sesssion. Concretely, all requests made in the last 30 minutes of the period covered by the log file will be part of uncompleted sessions. This starts at 1 for the first session of a user in the log file and will be incremented for each new session started by that user in the same log file.