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A Package Function Tutorial
I have written a brief introduction to writing package functions that implement most of the bells and whistles one would associate with a professionally written function. Some of the topics covered are implementation of Automatic in functions, overloading of built-in symbols, and others. Yes, most of the material can be found scattered in the shipping documentation, but my sense is that there is no good place to find essentially a checklist of the features a good function should have, like argument checking, attributes, syntax coloring, etc. You will find that I am no expert, but perhaps someone at Wolfram (or elsewhere) will be offended enough to contribute some good suggestions. You can find it at my website, http://www.thebushman.net. Here you will also find a package I published last month, a NURBS package providing a bridge from parametric curves and surfaces to CAD- friendly IGES format.