You can use an instance number to match a specific node out of all candidates. For example, the pattern week[2] matches the third week node of the current context in mydvd7.xml. If the context is January we will match one node (try it):
var matchedNodes = xmlDoc.childNodes[3].childNodes[1].childNodes[0].
selectNodes('week[2]');
alert("Number of matched nodes: " + matchedNodes.length);
The pattern month[week][2] matches the third month node that has a week node (try it):
var matchedNodes = xmlDoc.childNodes[3].childNodes[1].
selectNodes('month[week][2]');
alert("Number of matched nodes: " + matchedNodes.length);
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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