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The XQuery Debugger perspective allows you to detect problems in an XQuery transformation process by executing the process step by step in a controlled environment and inspecting the information provided in the special views. To switch the focus to this perspective, select the XQuery Debugger button in the top-right corner of the interface or Window > Open perspective > XQuery Debugger.

The workspace in this perspective is organized as an editing area assisted by special helper views. The editing area contains editor panels that you can split horizontally or vertically in a stack of XML editor panels and a stack of XQuery editor panels. The XML files and XQuery files can be edited in Text mode only.

The layout of this perspective is composed of the following components:
Provides menu driven access to all the features and functions available in the XQuery Debugger.
Contains all actions needed to configure and control the debugging process. The toolbars can be configured to suit your specific needs.
XML Source Pane
The editing pane where you can display and edit data or document-oriented XML documents.
XQuery Source Pane
The editing pane where you can display and edit XQuery files.
Output View
Displays the transformed output that results from the input of a selected document (XML) and selected XQuery document to the XQuery transformer. The result of transformation is dynamically written as the transformation is processed. There are two types of views for the output: a text view (with XML syntax highlight) and an XHTML view.
Debugging Information Views
Presented in two panes, they display various types of information that can be used to understand the transformation process. For each information type there is a corresponding tab. While running a transformation, relevant events are displayed in the various information views. This allows you to obtain a clear view of the transformation progress. See the Debugging Information Views topic for a list of all the information views (and links to more details on each view).
Note: You can add XPath expression automatically in the XWatch view using the Watch expression action from the contextual menu. If you select an expression, or a fragment of it, and then click Watch expression in the contextual menu, the entire selection is presented in the XWatch view. Expressions displayed in the XWatch view are normalized (unnecessary white spaces are removed from the expression).
For more information about the XQuery debugging capabilities in Oxygen XML Developer, watch our video demonstration: