Case Study Writing a DTD for the Day Planner Application

In this section, we build upon the case study introduced in Chapter 5. Figure 6.15 lists the external subset of the DTD for the day planner XML document, planner.xml. The following document type declaration is inserted into the day planner XML document lt DOCTYPE planner SYSTEM planner.dtd gt 1 lt -- Fig. 6.15 planner.dtd -- gt 2 lt -- DTD for day planner -- gt 4 lt ELEMENT planner year gt 6 lt ELEMENT year date gt 7 lt ATTLIST year value CDATA REQUIRED gt 9 lt ELEMENT date note gt 10 lt...