You’d think that you could do something like this to get meta description and keywords from umbraco

 <meta name="description" content="<umbraco:Item runat='server' field='PageDescription'/>" />

Unfortunately umbraco will render this:

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><meta name="description" content="&lt;umbraco:Item runat='server' field='PageDescription'/>" /> 

The solution is inline xslt:

<umbraco:Item ID="Item" Field="PageDescription" runat="server" Xslt="concat('<meta name=&quot;description&quot; content=&quot;',{0},'&quot;/>')" XsltDisableEscaping="true"></umbraco:Item>