Source Entity Types are used to define types of source entities. Every article is tagged with both a contributor and a source. A contributor is the overall publisher for the article. As an example, The Wall Street Journal is a contributor. They publish using multiple sources such as WSJ.com | What's News and WSJ.com | Business News. In addition to contributor and source, we will add an author if one is credited in the article.
FTS Apollo™ also has specialized topics called source categories. These are groupings of sources based on the type of source being captured. A Full Hierarchy is available to use like you would any other Entity.