Question 1

What is XPath and what is it used for?

Accepted Answer

XPath (XML Path Language) is a query language for selecting nodes from an XML or HTML document. It uses a path-like syntax to navigate the document tree — for example, //book/title selects all elements that are children of <book> elements anywhere in the document. XPath is used in XML processing, XSLT transformations, web scraping, browser automation (Selenium, Playwright), and XML schema validation.

Question 2

What is the difference between / and // in XPath?

Accepted Answer

A single slash (/) selects from the root of the document or the direct child of the current node. For example, /bookstore/book selects elements that are direct children of the root . A double slash (//) selects nodes at any depth. //book selects all elements anywhere in the document, regardless of nesting level. Prefer // when you don't know or care about the exact depth.

Question 3

How do I filter XPath results by an attribute value?

Accepted Answer

Use a predicate with @attributeName. For example, //book[@category='cooking'] selects all <book> elements that have a category attribute equal to 'cooking'. To select elements that simply have the attribute (regardless of value), use //book[@category]. To filter by position, use //book[1] for the first book, or //book[last()] for the last one.

Question 4

What is the difference between XPath 1.0 and XPath 2.0/3.0?

Accepted Answer

Browsers implement XPath 1.0 via document.evaluate(). XPath 2.0 and 3.0 add a richer type system, sequence operations, and many more built-in functions (string-join, tokenize, etc.), but are not natively available in browsers. This tool uses the browser's built-in XPath 1.0 engine. For XPath 2.0+, you would need a server-side library (such as Saxon in Java or lxml in Python).

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