Comment by PaulHoule

Simple triples like

  :BobB a :Cat .
  :BobB rdfs:Label "Bob B" .
  :BobB :weightInKg 4.1 .

aren't sufficient for situations where things change over time, people have different opinions, etc. You can write something like

   [
      :subject :BobB .
      :predicate :weightInKg .
      :object 4.1 .
      :measuredBy :PaulHoule .
      :measuredWhen "2024-07-16Z"^^xsd:date .
      :comment "Estimate by visual observation because Bob B wouldn't let me pick him up"
   ]

but people don't usually do that. I wrote a lot about this stuff in a technical report for ISO that is about to be published but, unfortunately, will be another ISO document that will cost 133 Swiss Franc. Probably the most advanced system for common-sense logic was Cyc

https://en.wikipedia.org/wiki/Cyc

which didn't change the world as people had hoped. It's usually not that hard to build a model for changes over time or other details of the commonsense domain for a limited domain (e.g. "Where was package 888310-313 at 3:42 PM last Thursday?") but its a very difficult problem to do generally.