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The node test is the only required portion of an XPath ___location step. As such, understanding it is critical to successfully employing XPath expressions.
There are three general types of node test:
A name test, which uses an expanded name and the relationship of that name to the specified axis to identify the nodes to be selected.
A node type test, which selects nodes based strictly upon their node type.
A targeted processing instruction test, which selects only those processing instruction nodes that match the specified type.