There was 1 tiny glitch, if you want your site map to perfectly pass validation you will want to switch the following lines of code...
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NOTE: This is addressing release 1.7Beta. Depending on when you read and download this extension this may have been addressed. Check the file against the above before and after to see.
Thanks for your cool review!
The validation issue is fixed in the latest build available on the jcrawler website.
Soon I'll release the next version!