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Oxygen XML Editor can be configured to automatically mark validation errors in the document as you are editing. The Enable automatic validation option in the Document Checking preferences page controls whether or not all validation errors and warnings will automatically be highlighted in the editor panel.

The automatic validation starts parsing the document and marking the errors after a configurable delay from the last key typed. Errors are highlighted with underline markers in the main editor panel and small rectangles on the right side ruler of the editor panel. Hovering over a validation error presents a tooltip message with more details about the error.

If the error message is long and it is not displayed completely in the error line at the bottom of the editing area, double-clicking the error icon at the left of the error line or on the error line displays an information dialog box with the full error message. You can use the arrow buttons in this dialog box to navigate through the errors issued by the Automatic Validation feature.