i am having a problem designing a new DTD over the existing one found at:
This is the DTD over their original XML file. I used a SAX parser to store specific data from the original file into my relational database.
Now i have to do the following: "Design a DTD to specify an XML document that consists of all publications in the conferences or journals that are co-authored by four specific authors Woo, Kin, Glas and Gert"
In few words what it needs is a DTD that is valid for if one of the 4 people is an author but how do i implement this restriction to 4 values only?