Allways read the snippet comments at the top of the snippet code.. In this snippet, there is:
| Usage:
| Insert [[MetaTags]] anywhere in the head section of your template.
| Don’t forget to set the full name of all document authors.
| You can find it at "Manage users" -> your username -> "full name".
| This value is used for the Author and Copyright meta tags.
|
| When you mark a page as "NOT searchable" - a Robots meta tag
| with "noindex, nofollow" is inserted to keep web search engines
| from indexing that document. After all, there’s little value in
| making your MODx document unsearchable to MODx, when
| Google still knows where it is! For "searchable" documents, no
| Robots meta tag is inserted. The default is "index, follow", so not
| putting it in reduced HTML bloat.
| A Googlebot meta tag with "noindex, nofollow, noarchive, nosnippet"
| is also output, to tell Google to clean out its cache.
|
| When you mark a page as "non cacheable", no-cache directives
| are inserted via the Cache-Control and Pragma meta tags.
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