Demo:California

California is a state located on the West Coast of the United States.

Semantic template usage
If you view source of this page you will see that it uses a semantic template to both display the infobox on the right-hand side and annotate this article with properties and a category (see the factbox below). __SHOWFACTBOX__

Using an inline query to produce inverted annotation
If you view source of this page you will see that it uses Template:Invert-property to generate wiki text for the property Property:Location of by querying for pages with its inverse Located in::. See the Germany page for other approaches to inverse relationships.

Using MediaWiki #REDIRECT to implement equivalent names
Another term for California is "The Golden State". In this wiki [ The Golden State] is a redirect to the California page, so searching for the property value of one, for example  Located in::California , finds the other. See such queries on the San Francisco page.