A DTD Example
Because being able to create DTDs is an essential XML skill these days (at least, until XML schemas are widely supported), I'll work through another example here.
This new example is a model for a book, complete with <CHAPTER>, <SECTION>, <PART>, and <SUBTITLE> elements. Here's what the document will look like:
<?xml version="1.0"?> <!DOCTYPE BOOK [ <!ELEMENT p (#PCDATA)> <!ELEMENT BOOK (OPENER,SUBTITLE?,INTRODUCTION?,(SECTION | PART)+)> <!ELEMENT OPENER (TITLE_TEXT)*> <!ELEMENT TITLE_TEXT (#PCDATA)> <!ELEMENT SUBTITLE (#PCDATA)> <!ELEMENT INTRODUCTION (HEADER, p+)+> <!ELEMENT PART (HEADER, CHAPTER+)> <!ELEMENT SECTION (HEADER, p+)> <!ELEMENT HEADER (#PCDATA)> <!ELEMENT CHAPTER (CHAPTER_NUMBER, CHAPTER_TEXT)> <!ELEMENT CHAPTER_NUMBER ...
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