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===Criteria?===
An example of a validation check is the procedure used to verify an [[ISBN]].<ref>[http://www.lac-bac.gc.ca/iso/tc46sc9/isbn.htm ''Frequently Asked Questions about the new ISBN standard''] {{Webarchive|url=https://web.archive.org/web/20070610160919/http://www.lac-bac.gc.ca/iso/tc46sc9/isbn.htm |date=2007-06-10 }} [[International Organization for Standardization|ISO]].</ref>
 
* Size. The number of characters in a data item value is checked; for example, an ISBN must consist of 10 characters only (in the previous version—the standard for 1997 and later has been changed to 13 characters.)