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I went back to peruse other headings on the Wiki site but to no avail. Except - I went back and looked more closely at the information I sent you.
“Sigma rules are currently written in a domain-specific language called FXL. It connects questions to a dozen distinct sources of facts necessary to answer them, including TAO and Memcached.”
What I found of interest was how the Sigma program connects to “a dozen distinct sources.” I ask myself, “What are these and who created them?” It goes on to give 2 examples “including TAO and Memcached.”
Note that TAO like SIGMA are two letters of the Greek alphabet. The TAO was used by the Author C. S. Lewis. If I am not mistaken it can be found in the book,”The Abolition of Man.” I’ll check on that later.
Also it appears that Memchached is a simple reduction of two words - Memory and - cached, but can’t know for sure until one follows these crumbs. One also needs to find out who the creators and owners are of these operations/companies.