What is “Contextual” Information, and Why is it Important?
We mean by this the relationship between equations and their labels, references and their numbers, subsection headings and their entries in the table of contents, and so on. While ordinarily readily available in TeX/LaTex source, conversion to Postscript irretrievably loses this structural information. The loss is unfortunate because with new formats such as PDF, the information can be used to provide active hyperlinks: e.g., in a PDF viewer you can click on an equation number and jump back to the specified equation. Moreover TeX itself can be processed as HyperTeX and, with the proper dvi previewer, clicking on equation numbers will bring up the desired equation in a separate window, or even retrieve other papers specified by their proper arch-ive/papernum identifier. HyperTeX works by redefining the standard macros and works retroactively for pre-existing TeX/LaTeX source — HyperTeX conversion is accomplished by merely re-TeXing with the modified macros. Since information is ordinar
