A mon sens, il ne faut garder que :
<meta name="description" content="...">
<meta name="keywords" content="...">
<META NAME="ROBOTS" CONTENT="INDEX,FOLLOW,ALL">
<meta http-equiv="Content-Language" content="FR">
<META NAME="Identifier-URL" CONTENT="...">
<meta name="REVISIT-AFTER" content="5 days">
<META NAME="Revisit" CONTENT="After 5 days">
<meta name="title" content="...">
non ?
Sinon : <meta name="googlebot" content="all"> ca sert à quoi ?