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In late 1994, Ward Cunningham wrote the first wiki engine to host the
"Portland (Design) Pattern Repository". It has evolved in features since
then.
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Soon thereafter, Patrick Mueller writes the first wiki clone using Rexx.
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The original wiki is file based, newer engines can also use SQL databases.
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Important features such as WikiCategories, ChangeSummary, etc. have been
introduced and maintained by the community since the beginning.
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Currently there are many wiki engines and derivatives.
If you have a favorite programming language, chances
are there is a wiki engine written using it.
