7.5 URL maintenance

Gather all external hyperlinks into definitions at the start of the LaTeX file. This helps to maintain the document when hyperlinks change, especially if multiple instances of the same hyperlink text occur (as they will if the printed document shows plain text of the links; or if the same link is made several times). It should also make it easier to gather these hyperlinks into communal input files for easier long-term maintenance. e.g.

\htmladdnormallink{{\it VLA Calibrator List}}{\vlacaliblink}

is easier to adjust throughout a document if the hyperlink alters, by changing the definition for vlacaliblink:

\def\vlacaliblink{http://www.nrao.edu/\~{}gtaylor/calib.html}

Note the work-around in the above example for the tilde in a URL (the tilde will otherwise be interpreted in TEX mode as a space, breaking the link). The tilde could also be inserted in rawhtml mode.

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