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======Introduction of the 'Course' concept======
<code>
URL: Unused
Http Headers:
  SessionID
  SessionTemplate
  SessionPatientID
Http Body:
  <request patientid=".." template=".." macro="..">
</code>
Timeline:
  * Http connection.
  * Use SessionId to connect to session or use SessionTemplate/SessionPatientID to create new session.
  * Feed http body to session which parses it and reacts upon its content.
  * Reply to client

Proposition: Remove all use of http headers. Use URI instead. Remove request from http body. Use URI instead.
  * Http connection.
  * Initial action is decided using the URI:
    * ''query/coursename[/templatename[/macroname]]?sessionid=42''
    * ''query/coursename[/templatename[/macroname]]?patientid=1234567890''
    * ''commit?sessionid=42'' http body containing xml with key/value pairs.
    * ''discard?sessionid=42''
Advantages:
  * No xml parsing needed to get required info on how to handle requests.
  * The template/patientid does not need to be passed around on the server, since the session lookup/creation is done earlier in the connection.
  * Redundancy is removed (http header fields and request xml http body)
  * Admin/Client connections can be differentiated without using the Client-Type header thus allowing the browser to act like a client (good for testing).
Disadvantages:
  * Admin/Client connections can be differentiated without using the Client-Type header thus allowing the browser to act like a client (may confuse users).