RDF

(Resource Description Framework) RDF is an extension of HTML5 that allows for semantic markup of web page content. By adding RDF to websites, search engines and other web applications will have better resources for providing users with results that are relevant to their searches/needs. The reason for the development of RDF was to better intertwine the data of the web. Much of the information on the web lives independently of other information. Incorporating this framework gives these applications a way to identify relationships of information based on their semantic meaning and not rely as heavily on keyword associations. Unlike XML, RDF does not rely on user created tags to describe the data.

RDF was designed as a metadata data model. It is generally used as a method for conceptual description or modeling of information that is implemented in web resources. This data model is similar to models those that resemble entity-relationship or class diagrams. RDF extends the linking structure of the Web to use URIs to name the relationship between things as well as the two ends of the link.