Read Chapters 3 and 4 of Inside XML (or equivalent discussion of DTD) 

Go to http://www.xmlspy.com/download.html and download 30 day trial version of XML
Spy
http://aspen.csit.fsu.edu/users/ozgur/docs/xmltools/xmlspy.html 

Take DTD for users and courses discussed in class and combine it with your first
assignment

Namely extend Course ELEMENT by a new CourseMaterials ELEMENT and give structure to
this so that it can be used to specify material (such as library materials) needed to
support a course
	Make an example Course XML Instance which has entries for all (required)
	ELEMENTS/ATTRIBUTES including your new CourseMaterials Element