It seems that Google is now autodetecting PermaLinks of dynamically-generated pages using the
rel="PermaLink" syntax. Here’s one of the results for my blog:
This is probably a really good idea, as it allows their search result links point to correct document even if the target site has been reorganized, combatting linkrot. Of course cool URLs don’t change, but as they’re titles too they can change during reorganizations, creating the need for permanent links.
Making the PermaLink of a page machine-readable is really easy, as shown by WikiPedia:
Permalinks can be displayed on the system using a HTML link element. This way authoring tools can automatically detect the permalink and use that for linking instead of the regular URL. The Link element should include two attributes:
<link rel="bookmark" href="<PermaLink URL>" />