Real World XML

Public Document Type Definitions

When you have a DTD that's intended for public use, you use the PUBLIC keyword instead of SYSTEM in the <!DOCTYPE> document type declaration. To use the PUBLIC keyword, you must also create a formal public identifier (FPI), and there are specific rules for FPIs:

• The first field in an FPI specifies the connection of the DTD to a formal standard. For DTDs that you're defining yourself, this field should be -. If a nonstandards body has approved the DTD, use +. For formal standards, this field is a reference to the standard itself (such as ISO/IEC 13449:2000).

• The second field must hold the name of the group or person that is going to maintain or be responsible for the DTD. In this case, you should use a name that ...