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To configure document validation options, open the Preferences dialog box and go to Editor > Document Validation. This page contains preferences for configuring how a document is checked for both well-formedness and validation errors.

The following options are available:
Maximum number of validation highlights
If a validation generates more errors than the number specified in this option, only the errors up to this number are highlighted in the editor panel and on the stripe that is displayed at the right side of the editor panel. This option applies to both automatic validation and manual validation.
Clear validation markers on close
If this option is selected, all the error markers added in the Problems view for that document are removed when the Oxygen XML Author Eclipse plugin plugin is closed.
Enable automatic validation
This causes the validation to be automatically executed in the background as the document is modified in Oxygen XML Author Eclipse plugin.
Delay after the last key event (s)
The period of keyboard inactivity before starting a new validation (in seconds).