Finding Elements by Id in a DOM Document Using XPath
XPath is an expression language for selecting nodes in an XML file.
See Finding Elements by Absolute Location in a DOM Document Using XPath for common XPath
expression for selecting elements. This example adds to those
examples by demonstrating the ability to select elements based on their
id.
The DTD of an XML file may declare that a certain attribute of
an element is a unique id. An attribute designated as such can
contain any value but no two id attributes can have the same value.
This example demonstrates some common uses of expressions that
use element ids; for more information on XPath, see the specification
at http://www.w3c.org/TR/xpath. In the example, the result of
an XPath expression is shown next to the expression; the numbers are
ids of elements in the sample file shown at the end of the example.
To execute an XPath expression, see
Finding Elements by Absolute Location in a DOM Document Using XPath. Here is the sample XML file
used in the example:
// Get element id 3
String xpath = "id('3')"; // 3
// Get all e elements directly under element id 3
xpath = "id('two')/e"; // 3 4 6
// Get elements with id='two', id='3', or id='seven'
xpath = "id('two 3 seven the fifth')"; // two 3 seven
// Note that this method of finding elements does not work
// if the id value contains a space
// Get a non-existent element
xpath = "id('100')"; // (none)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root [ <!ELEMENT e (e*) >
<!ATTLIST e id ID #REQUIRED>
]>
<root>
<e id="1">
<e id="two">
<e id="3"/>
<e id="4">
<e id="the fifth"/>
</e>
<e id="6"/>
</e>
</e>
<e id="seven"/>
</root>
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