...While that sentiment may sound postmodernist in spirit, Otlet was no semiotician; rather, he simply believed that documents could best be understood as three-dimensional, with the third dimension being their social context: their relationship to place, time, language, other readers, writers and topics. Otlet believed in the possibility of empirical truth, or what he called "facticity"—a property that emerged over time, through the ongoing collaboration between readers and writers. In Otlet's world, each user would leave an imprint, a trail, which would then become part of the explicit history of each document. Vannevar Bush and Ted Nelson would later voice strikingly similar ideas about the notion of associative “trails” between documents. Distinguishing Otlet's vision from the Bush-Nelson (and Berners-Lee) model is the conviction—long since fallen out of favor—in the possibility of a universal subject classification working in concert with the mutable social forces of scholarship....