The document discusses using natural language processing (NLP) to convert documents and data into the Resource Description Framework (RDF) format to enable machines to better understand unstructured information on the web. It notes that while machines can currently understand structured data through technologies developed for Web 3.0, they still struggle with unstructured content like images, videos, songs, and natural language texts. The document introduces NLP to RDF as a potential step towards Web 4.0, where machines can gain a deeper understanding of documents and answer questions about their contents by converting them into structured RDF representations.