Missing descriptions of properties/classes description

[karou28]

Hi,
Thanks for providing the Freebase RDF dump and Virtuoso setup — it's been very useful for restoring SPARQL access to Freebase data.
While exploring the RDF graph, I noticed that many relations (properties) and classes (types) — such as film.actor.film, people.person, or location.location — do not have any common.topic.description triples, even though they did have English descriptions in the original Freebase interface.
For example, this query:

PREFIX ns: <http://rdf.freebase.com/ns/>

SELECT ?description WHERE {
  ns:film.actor.film ns:common.topic.description ?description .
  FILTER (lang(?description) = "en")
}

...returns nothing, and the same applies to other widely used classes like people.person.
This makes it difficult to retrieve human-readable documentation for the meaning and purpose of relations or classes, which is crucial for understanding Freebase’s schema.

Could you clarify:
Were common.topic.description values for types and properties excluded intentionally?
Or might they have been dropped during RDF preprocessing?
Is there a version of the dump that retains this metadata?

Best regards,
karou