<div>Dear Sir/Madam,</div>
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<div>I now use CalendarX to create a calendar like GoogleCalendar in the Plone product. </div>
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<div>In my system, users can create events, but they must not conflict with the ones of other users. For instance, user 'john' creates an event from 5am to 8am on March 20, hence, user 'marie' cannot create an event from 4am to 6am or 7am to 9am, etc.. </div>
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<div>By the way, at this time, I just create events only and cannot check that confliction. Moreover, I want to create database of that system in order to check constrains and confliction easily. But I cannot create it, and integrate users' information of the Plone (or Zope) in to my Calendar system.</div>
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<div>Please let me know how to do now.</div>
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<div>Thank you very much.<br><br>Sincerely,<br><br>Hoang Bao Thien </div>