When a "robots-nocontent" tag is used to mark a section of content on a web page, Yahoo! will not use the terms contained in that section as information for finding the page or for the abstract of that page in search results. Note: Using a "robots-nocontent" tag to mark explicit sections of content is not considered "cloaking" because all the content on the page is available to us (unlike "cloaking" where we may be served content that is different from what users see.)
The "robots-nocontent" tag is a useful tool for webmasters.
Applying the "class=robots-nocontent" Attribute:
<div class="robots-nocontent">This is the navigational menu of the site and is common on all pages. It contains many terms and keywords not related to this site
<span class="robots-nocontent">This is the site header that is present on all pages of the site and is not related to any particular page
<p class="robots-nocontent">This is a boilerplate legal disclaimer required on each page of the site
<div class="robots-nocontent">This is a section where ads are displayed on the page. Words that show up in ads may be entirely unrelated to the page contents
This attribute offers webmasters a great deal of flexibility.You can use the "class=robots-nocontent" attribute with all XHTML tags.