Use one of the actions for validating the current document:
Select menu Alt+Shift+V V (Cmd+Alt+V V on Mac OS)) or click the button available in the Validate toolbar to return an error result-list in the Message panel. Mark-up of current document is checked to conform with the specified DTD, XML Schema or Relax NG schema rules. It caches the schema and the next execution of the action uses the cached schema.
→ (Select menu
→ or click the button available in the Validate toolbar to reset the cache with the schema and validate the document. This action will also re parse the catalogs and reset the schema used for content completion. It returns an error result-list in the Message panel. Mark-up of current document is checked to conform with the specified DTD, XML Schema or Relax NG schema rules.Select menu Alt+Shift+V E (Cmd+Alt+V E on Mac OS)) or click the button available in the Validate toolbar. This can be used to validate the current document using a selectable schema (XML Schema, DTD, Relax NG, NRL, NVDL, Schematron schema). Returns an error result-list in the Message panel. Mark-up of current document is checked to conform with the specified schema rules.
→ (Select contextual menu of Navigator or Package Explorer view, → to validate all selected files with their declared schemas.
Select contextual menu of Navigator or Package Explorer view, → to select a schema and validate all selected files with that schema.
Alt+Shift+V X (Cmd+Alt+V X on Mac OS)) or click the toolbar button to clear the error markers added to the Problems view at the last validation of the current edited document.
→ (Select contextual menu of Navigator or Package Explorer view, → to configure and apply a validation scenario in one action to all the selected files in the Navigator or Package Explorer view.
Also you can select several files in the views like Package Explorer, Navigator and validate them with one click by selecting the action Validate selection, the action Validate selection with Schema ... or the action Configure Validation Scenario ... available from the contextual menu of that view, the submenu Batch Validate.
If there are too many validation errors and the validation process is long you can limit the maximum number of reported errors.