The package is based on the Calendar class, a class capable of printing an ascii calendar table that closely resembles the output of the typical Unix cal command. The internal code is written entirely in Tcl, therefore doesn't rely on the existance of cal on the system. XmlCalendar inherits the basic methods and adds XML tagging to the table. XmlCalendar prints an XML calendar table whose header, weekdays banner and days rows tags are configurable. Also specific days or specific weeks can be given arbitrary attributes.

Calendar core methods are based on the cal procedure written by Richard Suchenwirth and published on the Tcl Wiki

	Note
	The Calendar package uses Tcl dict command to manage markup information. Hence either Tcl8.5 or Tcl8.4 with package dict are required.