When specifying the structure of an XML file in the DTD, you will reach the leaf cells in your XML tree structure. Leaf-cell elements do not include element but are pure Parsed Character Data (PCDATA). You define their content as (#PCDATA). Here are the leaf cells in our mydvd XML file:
<!ELEMENT heading (#PCDATA)>
<!ELEMENT subhead (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT date (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT week (#PCDATA)>
Here is the mydvd XML file:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="mydvd7.xsl"?>
<!DOCTYPE sales SYSTEM "mydvd8.dtd">
<sales>
<summary>
<heading>MyDVD Rental Store</heading>
<subhead>Periodical Sales Report</subhead>
<description>Sales Report for January, February, and <&month;> of 2001</description>
<author>author: &preparedby;</author>
<date>Jan 30, 2002</date>
</summary>
<data>
<month>
<name>January 2001</name>
<week number="1" dvds_rented="12000" />
<week number="2" dvds_rented="15000" />
<week number="3" dvds_rented="18000" />
<week number="4" dvds_rented="11800" />
</month>
<month>
<name>February 2001</name>
<week number="2" dvds_rented="12390" />
<week number="3" dvds_rented="19050" />
<week number="4" dvds_rented="11200" />
</month>
<month>
<name>March 2001</name>
<week number="1" dvds_rented="15300" />
<week number="2" dvds_rented="12390" />
<week number="3" dvds_rented="10050" />
<week number="4" dvds_rented="11230" />
</month>
</data>
</sales>
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