Compatibility with Atomz.com noindex tag
This help file expands on the concepts covered in How to prevent sections of your pages from being indexed.
The popular Atomz.com search application supports a
<noindex> tag that works in a way identical to FDSE's
<!-- robots content="noindex" -->. The FDSE syntax is better because it is more versatile (supporting noindex, nofollow, and none as attributes) and, because is uses comments rather than invented tags, it does not cause problems with HTML validators.
For web sites that have already been customized to support Atomz'
<noindex> tag, it may be helpful to modify FDSE to support that tag as well. To do so:
The FDSE crawler will then detect and observe the Atomz tags.
"Compatibility with Atomz.com noindex tag" https://www.xav.com/scripts/search/help/1138.html