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XML and Related Technologies
book

XML and Related Technologies

by Atul kahate
May 2024
Beginner to intermediate content levelBeginner to intermediate
527 pages
17h 52m
English
Pearson India
Content preview from XML and Related Technologies
250 • XML & Related Technologies
6.3.4 Using Predicates
So far, we have limited our discussions to the axes and node tests. We will now look at the third aspect of a
location path: predicates.
Predicate provide us fine-grained control over the nodes to be selected. They are contained inside square
brackets. For example, consider the following XPath expression:
child::COMMENT [position ( ) = 1]
This allows us to select the first <COMMENT> element child of the context node. For this, we make use
of the position ( ) function.
A predicate can return multiple nodes. For example, consider the following predicate:
child::COMMENT [position ( ) > 1]
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Publisher Resources

ISBN: 9781282652262