<META name revisit-after>

Description:

This is a very important tag as it tells the search engine how often to spider your page. Generally you should set this to between 30 days and one year.

Attributes:

<meta name="Revisit-After" content="text">
Text is a string such as 45 days which tells the spider how often to visit the page.

Examples:

<meta name="revisit-after" content="20 Days">

Revisit the page every 20 days.