XML by Example

<!DOCTYPE address-book SYSTEM “address-book.dtd”>

It consists of markup (<!DOCTYPE), the name of the top-level element

(

address-book), the DTD (SYSTEM “address-book.dtd”) and a right angle

bracket. As Listing 3.1 illustrates, the document type declaration appears

at the beginning of the XML document, after the XML declaration.

The top-level element of the document is selected in the declaration.

Therefore, it is possible to create a document starting with any element in

the DTD. Listing 3.3 has the same DTD as Listing 3.1, but its top-level ele-

ment is an

entry.

Listing 3.3: An Entry

<?xml version=”1.0”?>

<!DOCTYPE entry SYSTEM “address-book.dtd”>

<entry> ...