Meta name="revisit-after" content="7 Days ?

Can someone please answer what the follow meta tags do? <meta name="revisit-after" content="7 Days"> <meta name="allow-search" content="yes"> <meta name="doc-type" content="Web Page"> <meta name="doc-class"... show more Can someone please answer what the follow meta tags do?
<meta name="revisit-after" content="7 Days">
<meta name="allow-search" content="yes">
<meta name="doc-type" content="Web Page">
<meta name="doc-class" content="Published">
Please explain in detail. I found it in the source code at http://www.cookevillewebdesigns.com/ and http://www.blackhawkinteractive.com/
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