Where can I obtain detailed APIs for the foundation components?
It's hard to find in-depth information on CQ5's components. E.g. in the Geometrixx example, this component is referenced in the header.jsp, but I can't find any reference to it online:
<cq:include path="userinfo" resourceType="foundation/components/userinfo"/>
There are these, but the usage details are incomplete:
I also found these docs but they're more advanced, as I don't want to write the Java to extend these components yet, I just want the information on using the components as tags and includes.
Thanks for any pointers you can provide.
The component foundation/components/userinfo shows information about the currently logged in user (In publish mode display name of non anonymous users & in author mode link to cc) . In order to find the information missing in docs go to respective components & open the component jsp file. Ex:- For your case it would be in /libs/foundation/components/userinfo/userinfo.jsp
Please refer  on how to use xtypes.
I have placed a documentation request to update the missing component information. For any additional details could you please file a daycare so that we can help & track it down.