This document provides instructions and an overview for a class exercise on marking up a text. It discusses key concepts around documents, texts, levels of meaning, and intertextuality. It explains that the goal of markup is to surface the latent hypertext in a text and make it available for analysis and interpretation. The exercise will involve using semantic HTML to markup the beginning of Jane Austen's Persuasion, developing a TEI-like content model. Elements will use class and id attributes, and div and span elements, following a technique called POSH (Plain Old Semantic HTML).