+ OpenID server (for `openid` and `openid2`). An optional `xrds-location`
+ parameter lets you specify the location of any [eXtensible Resource
+ DescriptorS](http://www.windley.com/archives/2007/05/using_xrds.shtml).
+
+ This lets you use an ikiwiki page as your OpenID. Example:
+
+ \\[[!meta openid="http://joeyh.myopenid.com/"
+ server="http://www.myopenid.com/server"
+ xrds-location="http://www.myopenid.com/xrds?username=joeyh.myopenid.com""]]
+
+* link
+
+ Specifies a link to another page. This can be used as a way to make the
+ wiki treat one page as linking to another without displaying a user-visible
+ [[ikiwiki/WikiLink]]:
+
+ \[[!meta link=otherpage]]
+
+ It can also be used to insert a html <link> tag. For example:
+
+ \[[!meta link="http://joeyh.myopenid.com/" rel="openid.delegate"]]
+
+ However, this latter syntax won't be allowed if the [[htmlscrubber]] is
+ enabled, since it can be used to insert unsafe content.
+
+* redir
+
+ Causes the page to redirect to another page in the wiki.
+
+ \[[!meta redir=otherpage]]
+
+ Optionally, a delay (in seconds) can be specified. The default is to
+ redirect without delay.
+
+ It can also be used to redirect to an external url. For example:
+
+ \[[!meta redir="http://example.com/"]]
+
+ However, this latter syntax won't be allowed if the [[htmlscrubber]] is
+ enabled, since it can be used to insert unsafe content.
+
+ For both cases, an anchor to jump to inside the destination page may also be
+ specified using the common `PAGE#ANCHOR` syntax.
+
+* robots
+
+ Causes the robots meta tag to be written:
+
+ \[[!meta robots="index, nofollow"]]
+
+ Valid values for the attribute are: "index", "noindex", "follow", and
+ "nofollow". Multiple comma-separated values are allowed, but obviously only
+ some combinations make sense. If there is no robots meta tag, "index,
+ follow" is used as the default.
+
+ The plugin escapes the value, but otherwise does not care about its
+ contents. In particular, it does not check the values against the set of
+ valid values but serves whatever you pass it.
+
+* guid
+
+ Specifies a globally unique ID for a page. This guid should be a URI
+ (in particular, it can be `urn:uuid:` followed by a UUID, as per
+ [[!rfc 4122]]), and it will be used to identify the page's entry in RSS
+ and Atom feeds. If not given, the default is to use the page's URL as its
+ guid.