Java Content Repository
There are precious few standards of the CMS industry. We work with a lot of standards, but there are few standards around the specific concept of managing content.
One of the exceptions is the Java Content Repository, which is a long-standing Java standard for a hierarchical content repository. I’ve worked with two CMSs lately that make heavy use of it – Adobe Experience Manager and Magnolia. In fact, the Pluralsight course for developing with AEM is one of the better ways to learn about the JCR. It’s a technology worth knowing about.
FYI: there’s a PHP port of the JCR, but – to my knowledge – there’s no .NET port…yet.