The Sindice API provides programmatic access to its semantic search capabilities. It is based on the OpenSearch spec. Over 10 billion pieces of data can already be searched within 100 million web pages with embedded RDF and Microformats. For example you can build on the API and find RDF with a certain "foaf:name" value.
The following is a list of how-to and tutorial content that matched your search term. ProgrammableWeb's how-to content comes from two sources; full-blown tutorials that we publish ourselves and other highly relevant tutorials that we find elsewhere on the Web. This list represents on combination of both tutorial types and if you go to ProgrammableWeb's API University, you'll not only be able to find more, they are organized based on your role (API providers or developers who consumes APIs). If you know of a tutorial that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.