Paste XML, type an expression, and see what it matches — instantly, in your browser. XML Foundry evaluates XPath 1.0 and XPath 3.1 with a conformant engine, highlights every matched node in the document, and explains errors in plain English. Nothing is uploaded: your XML never leaves the tab.
XPath on the Recipes sample:
//recipe[@difficulty = 'easy']/nameReturns the name of every recipe whose difficulty attribute is 'easy'.
The Sandbox is a full workbench rather than a single input box, so you can work the way you would in a real editor.
XPath 1.0 is what browsers, Selenium, and most XML tooling implement. XPath 3.1 adds sequences, let bindings, arrow operators, maps, arrays, and a much larger function library. If your expression has to run inside a browser or a Selenium locator, test it as 1.0. If it runs inside a modern XSLT or XQuery processor, use 3.1.
The version toggle re-evaluates immediately, which makes it a fast way to find out whether a failing expression is a syntax problem or a version problem.
Almost every empty result comes down to one of three things: the document has a default namespace and the expression doesn't account for it, the path starts from the wrong context node, or a predicate compares a node against a string that includes surrounding whitespace.
The Sandbox flags all three. Namespace-aware documents get a prefix panel, the axes explorer shows what is actually reachable from a chosen node, and normalize-space() is one click away in the reference.