This website is unstructured data. Technically, it is semistructured data, because there are clearly headers, a hierarchy of pages and links that all provide structure. Microsoft Word documents and PDFs also have some amount of structure, but it is not explicit. But we still call it "unstructured".
Epinomy can index any content from which we can extract a stream of text. That includes Office documents, raw text, e-mails, instant messages, RSS feeds and even, to a limited extent, some image and movie files.
At its core, Epinomy is a full-text search engine that is very similar to the Google and Bing search engines.