Can you use more than one meta robots tag per page?
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If you want to add both "noindex, follow" and "noopd" should you add two meta robots tags or is there a way to combine both into one?
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you can use:
<meta name="robots" content="noindex, follow, noodp" /> -
You can combine them all into one line .
The SEOmoz beginners guide has some info on it http://www.seomoz.org/beginners-guide-to-seo/search-engine-tools-and-services
For what its worth using Meta Robots to restrict crawling is actually better than simply using a Robots.txt. Largely because a Robot will still see a page url if it is linked to from another source and those links can pass page rank, but the page will never pass any forward.
-Phil