Many tools use built-in code strings
print "<HTML><P>", var, "</HTML>"
Opaque and untunable
Expensive to develop and maintain
Sema's ETK pioneered 'schemas' in 1986
Tunable within constraints of code generator
Low-cost maintenance, up to today
Still, ETK had 15-20 separate code generators
Libero (1992) used multilanguage schemas
Any programming language (C, Java, VB, Cobol,...)
Still constrained by code generator
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