web commit by JoshTriplett: Use conditionals.

diff --git a/doc/openid.mdwn b/doc/openid.mdwn
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+[[meta title="OpenID"]]
+
+[[template id=note text="""
+[[if test="enabled(openid)"
+     then="This wiki has OpenID **enabled**."
+     else="This wiki has OpenID **disabled**."]]
+"""]]
+
+[OpenID](http://openid.net) is a decentralized authentication mechanism
+that allows you to have one login that you can use on a growing number of
+websites.
+
+To sign up for an OpenID, visit one of the following identity providers:
+
+* [MyOpenID](https://www.myopenid.com/)
+* [GetOpenID](https://getopenid.com/)
+* [Videntity](http://videntity.org/)
+* [LiveJournal](http://www.livejournal.com/openid/)
+* or any of the many others out there..
+
+Your OpenID is the URL that you are given when you sign up.
+[[if test="enabled(openid)" then="""
+To sign in to this wiki using OpenID, just enter it in the OpenID field in the
+signin form. You do not need to give this wiki a password or go through any
+registration process when using OpenID.
+"""]]
+
+---
+
+It's also possible to make a page in the wiki usable as an OpenID url,
+by delegating it to an openid server. Here's an example of how to do that:
+
+       \[[meta link="http://www.myopenid.com/server" rel="openid.server"]]
+       \[[meta link="http://yourid.myopenid.com/" rel="openid.delegate"]]