It's been a while and I was just a dabbler at the time - but from what I recall, Exec at least has some object-oriented features or at least influences? This i

It's been a while and I was just a dabbler at the time - but from what I recall, Exec at least has some object-oriented features or at least influences? This is all hazy but wasn't there some sort of base "node" struct which had various extensions depending on the entity - at least I recall lists of such nodes where some operations could would with "base nodes" while others required specific "sub-type" nodes? At least I remember finding the model very confusing initially - a lot of the technical documentation seemed quite abstract to me as a C novice at the time.