Peter started working on SGML software while the standard was still being built. He is the primary architect of Author/Editor, one of the earliest and perhaps the largest-selling of all the SGML editors. In recent years, he has had an even greater impact on the world as the primary architect of HoTMetaL, one of the earliest HTML editors, and still a popular product.
In the XML process, Peter spoke for those who had to write the software that authors would use. In particular, he was a force pushing for many of the simplifications in the rules governing XML DTDs.
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