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Like other SEO plugins (e.g. The SEO framework) SmartCrawl should have the possibility of turning of the lastmod directive. There are two reasons for that:
1. in some cases it is not good to show the lastmod (as the post/page was not updated long time, you can still "reactivate" old project with old SQL timestamps and this will not help you)
2. it is optional protocol directive
3. it solves other problem with SQL timestamps (as the 0000-00-00 default value of MyISAM engine)
