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You can use the two marked statements of the general-purpose mechanism, shown in Segment 829, in place of the one marked statement of the file-specific mechanism, without attempting to understand how those statements work in detail. Alternatively, you can dive into the details, learning about a special class used in connection with resource locators.
If you wish to avoid the details, you should skip ahead to Segment 836 to learn about the general-purpose mechanism's characteristics.