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I want to illustrate one aspect of progress with this basic discussion of the various types of references in texts. While paper print-outs certainly have abasic  benefit of explicitly labeling notable document fragments, the digital formats take this feature to a new level, as you can now actively navigate your document by interacting with the labels. And importantly, this is not only true for web documents, but also with any current PDF document. While PDFs were originally created for platform-independent but print-oriented documents, they have partially evolved to also support various structural annotations and active features, akin to HTML documents. Why is this important? Because it demonstrates the direction of evolution of our documents in the digital age, as originally print-oriented formats are starting to allow the embedding of more abstract structural information. In a nutshell:  Structural document formats, such as HTML, generalize over and may eventually supercede print-oriented formats, such as PDF.  But if youever  want to see them on paper, paper today,  you would have to do some legwork. \subsection*{The Typesetting Iceberg}