Each XML tag is a DOMDocument node. Some tags define the default values for the current XML file. Do not overlook these tags -- they all take up node numbers and thus affect the DOMDocument mapping into nodes. Even the referenced DTD file takes up some node numbers.
Let's look at the top-tier nodes of mydvd7.xml. The root has four child nodes. The first one is xml (xmlDoc.childNodes[0].nodeName):
<?xml version="1.0"?>
The second child node is xml-stylesheet (xmlDoc.childNodes[1].nodeName):
<?xml-stylesheet type="text/xsl" href="mydvd7.xsl"?>
The third child is the DTD (Document Type Definition) file. The name of the node is sales (xmlDoc.childNodes[2].nodeName), from the DOCTYPE tag:
<!DOCTYPE sales SYSTEM "mydvd7.dtd">
This sales node has three child nodes. They are the ENTITY references in mydvd7.dtd:
<!ENTITY preparedby "John Smith">
<!ENTITY month "April">
<!ENTITY day "Wednesday, ">
The three child nodes of sales are therefore:
preparedby (xmlDoc.childNodes[2].childNodes[0].nodeName)month (xmlDoc.childNodes[2].childNodes[1].nodeName)day (xmlDoc.childNodes[2].childNodes[2].nodeName)
Here is mydvd7.xml for your reference:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="mydvd7.xsl"?>
<!DOCTYPE sales SYSTEM "mydvd7.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="1" dvds_rented="11500" />
<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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