Location Paths
The most useful XPath expression is a location path. A location path identifies a set of nodes in a document. This set may be empty, may contain a single node, or may contain several nodes. These can be element nodes, attribute nodes, namespace nodes, text nodes, comment nodes, processing-instruction nodes, root nodes, or any combination of these. A location path is built out of successive location steps. Each location step is evaluated relative to a particular node in the document called the context node .
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