Digging in a bit: I am not ‘IT’, quite ignorant honestly so I don’t know much of what I just read. However, while looking at “Open-sourcing HAXL, a Library for Haskell” the first thing that caught my eye was the word “Sigma.” Another alternative for “SIG” perhaps? The next thing that I noticed was an insulation for unknown rule makers. Anyway here is the excerpt:
At Facebook, the Sigma service is responsible for classifying different pieces of content. Sigma clients ask high-level questions such as “Is this post spam?” or “Is this URL associated with malware?” and Sigma responds with answers like “Yes, block this account” or “No, carry on”.
“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. FXL also serves as a scripting language, insulating rule authors from the underlying C++ implementation of Sigma.”
What do you think so far with your digging?