Pathology is a thoroughly Mac-native, XPath/XQuery debugger and visualizer. Pathology is written entirely in Cocoa/Objective-C so it feels right at home on your Mac.

Pathology includes:

• A full-featured XPath text editor with syntax highlighting, and code auto-completion.
• Several syntax highlighting themes to choose from (in Preferences).
• Check 'Debug' to slowly proceed through the XPath expression step-by-step, seeing the filtered result nodes each step of the way.
• An interactive console with click-able error messages that lead you right to the syntax or runtime errors in your XPath or source XML.
• Ability to check your source XML for well-formedness, or validity against DTDs, W3C XML Schemas and RELAX NG schemas.
• Each Pathology window is a .pathology document that can be edited, saved and re-opened later.
• A query results table contains details on the selected nodes or items. Clicking on a row focuses the corresponding node in the source XML text.
• Query result nodes are also highlighted conspicuously in the source XML text.

Pathology's XPath engine is powered by Panthro, an open-source implementation of XPath 3.0 in Objective-C that includes the ability to debug the evaluation of an XPath expression step-by-step.

As a Mac developer learning XPath, Pathology is the single-window, graphical XPath visualizer with Mac-native text editing, code completion and tab triggers that I've always wished I had.

Code completion with Fuzzy Matching

Function argument Tab Triggers

Query results table

Source results highlighting

Debug expressions step-by-step

Separate Context Node & result set highlighting

Interactive Console with Error messages