In the 1970s, Tunnicliffe led the development of a standard called GenCode for the publishing industry and later was the first chair of the International Organization for Standardization committee that created SGML, the first standard descriptive markup language.
In the 1970s, Tunnicliffe led the development of a standard called < em > GenCode </ em > for the publishing industry and later was the first chair of the < em > International Organization for Standardization </ em >.
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