If you entered an actor, you should see them below, they will also be present on other queries:
Summary
In these pages, you've seen how the Semantic can build on the existing widely available, hypertext web by adding re-usable data. Going from the flexibility of wikis, we've encoded re-usable information that can be used for queries and views. Form front ends can simplify entering field data.
What hasn't been covered is re-using data across sites. Semantic Mediawiki extensions allow auto completion based on ontologies from other sites. So your site about actors could query a site about locations or causes of death. Semantic Mediawiki can query RDF data sources, tab separated values and database data locally or on other sites.
While Semantic Mediawiki is just one approach to SemWeb, it practically builds on the underlying principals of wikis and the most popular open source Wiki software that has many extensions and supporters and users, including Wikipedia. When Wikipedia flips a switch, all its data will become semantic (evidenced today in sites like http://dbpedia.org/About) and the culture will evolve to expect more and more refined and re-usable data.