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By default, WSDL files are validated as you type. To change this, open the Preferences dialog box (Options > Preferences), go to Editor > Document Checking, and deselect the Enable automatic validation option.

To validate a WSDL document manually, select the Validate action from the Validation toolbar drop-down menu or the Document > Validate menu. The validation problems are highlighted directly in the editor, making it easy to locate and fix any issues.