In Brief

Here are the crucial concepts for this chapter:

• XPath expressions can be evaluated to create a result.

• Location steps indicate a single step in a location path .

• Location paths are used to locate data and return node-sets .

• Axes let you specify how you want a location step to locate data.

• Predicates are optional parts of location steps that let you be more specific about the data you want.

• Nodes are the fundamental building blocks of XML documents.

• Root nodes are the topmost nodes in documents.

• A context node is the current node that is being processed .