Benefits of XPath

XPath is designed for XML documents. It provides a single syntax that you can use for queries, addressing, and patterns. XPath is concise, simple, and powerful. XPath has many benefits, as follows:

Queries are compact.

Queries are easy to type and read.

Syntax is simple for the simple and common cases.

Query strings are easily embedded in programs, scripts, and XML or HTML attributes.

Queries are easily parsed.

You can specify any path that can occur in an XML document and any set of conditions for the nodes in the path.

You can uniquely identify any node in an XML document.

Queries return any number of results, including zero.

Query conditions can be evaluated at any level of a document and are not expected to navigate from the top node of a document.

Queries do not return repeated nodes.

For programmers, queries are declarative, not procedural. They say what should be found, not how it should be found. This is important because a query optimizer must be free to use indexes or other structures to find results efficiently.

XPath is designed to be used in many contexts. It is applicable to providing links to nodes, for searching repositories, and for many other applications.

When you define a query, keep in mind that XML data can be represented as a tree. A tree is a hierarchical representation of XML data. The root node is the top of the tree. Each element, attribute, text string, comment, and processing instruction corresponds to one node in the tree. A tree also shows the relationships among the nodes. For more information on tree structure, see Tree Representation of a Sample XML Document.

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