Selecting from a Set of Child Elements 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 apply a selection filter to a
set of child elements. For example, if an element A contained
several B elements, you could include only the first B
element or all but the first B element.
Filtering in XPath is specified with a predicate after
the element name. A predicate has the form
[expression]. For example,
selects the 3rd section element from the 2nd chapter element
under the root element book.
This example demonstrates some common filters; 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.
Note that //e[1] does not return the first e element in the
document because the [1] predicate applies to e, which
represents the set of e elements under one element and not
to //e, which represents the set of e elements in the
document. The following expression retrieves the first e element
in the document:
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:
/book/chapter[2]/section[3]
// Get the first element under the root
String xpath = "/*/*[1]"; // 2
// Get the second elem1 element under the root
xpath = "/root/elem1[2]"; // 8
// Get all first-born e elements in the document; that is, for all
// e elements with e element siblings, include only the first sibling
xpath = "//e[1]"; // 4 6 10 12
// Get the first e element in the document
xpath = "(//e)[1]"; // 4
// For all e elements with e element siblings, include only
// the first 3 siblings
xpath = "//e[position() <= 3]"; // 4 6 10 11 12
// Get all last-born e elements in the document; that is, for all
// e elements with e element siblings, include only the last sibling
xpath = "//e[last()]"; // 4 6 11 12
// Get the last e element in the document
xpath = "(//e)[last()]"; // 12
<?xml version="1.0" encoding="UTF-8"?>
<root id="1">
<elem1 id="2">
<elem2 id="3">
<e id="4"/>
<elem3 id="5">
<e id="6"/>
</elem3>
<elem3 id="7"/>
</elem2>
</elem1>
<elem1 id="8">
<elem2 id="9"/>
<e id="10"/>
<e id="11"/>
</elem1>
<e id="12"/>
</root>
If i want to take the element...then what we can?????
i mean to say most inner child like elem3--->e with id 6
v
I want to print all the element names which have the as 'erase'. If at a particular level in xml, the parent has 'erase' i dont want search its childs for action- erase. Consider case
erase
erase
erase
erase
erase
Answer should be "b,c,d".
I want to print all the element names which have the as 'erase'. If at a particular level in xml, the parent has 'erase' i dont want search its childs for action- erase. Consider case
erase
erase
erase
erase
erase
Answer should be "b,c,d".
I want to print all the element names which have the as 'erase'. If at a particular level in xml, the parent has 'erase' i dont want search its childs for action- erase. Consider case
erase
erase
erase
erase
erase
Answer should be "b,c,d".