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Instructions provided describe the steps to white-out or 'mask' all other features outside the extent of the feature of interest designated by the Data Driven Pages indexing layer.
The following workflow is most useful when working with polygon features as the Data Driven Pages indexing layer.
An example of when this workflow might be useful is in the event you would like each of the Hawaiian islands to be displayed on their own data driven page without parts of the nearby islands showing.
When browsing through the Hawaii map book, there are slivers of nearby islands displayed, which are not the feature of interest for each page. See the following screen capture and note these slivers, circled in red.
Page Definition Queries are only available when Data Driven Pages are enabled. If Data Driven Pages are not enabled, you will not see the Page Definition button on the Definition Query tab of the Layer Properties dialog box.
By choosing the same Page Name field as the Name Field specified in the Data Driven Page Setup dialog, the Mask features are now filtered by name for the current page. While browsing through the pages, the query changes, and a new set of features is drawn appropriate to the new page. By choosing 'Not Match' in the next step, all features in the Mask layer that do not match the name for the current page are displayed.
Currently, the page definition does not appear to have changed anything in the map, but the Mask symbology must still be changed.
If planning to utilize a background, basemap, or raster layer in the map, this workflow does not provide desired results.