Most advanced rule-based NLG system?

Is there any example of a rule-based NLG system which parses human natural language (even if only a simple subset of it) into some kind of semantic representation, has some kind of response decision-tree (if a question, answer; if a greeting, reciprocate), and has some kind of rudimentary thinking capabilities, the ability to consult structured semantic data?

I am picturing similar to Wikidata it stores knowledge in the form of relations. Attributes can be compulsory, weighted, or merely associative.

For …

advanced languagetechnology nlg