Querying custom objects for

[Bhogi]

Hello all.

There are protocol extensions for querying custom objects via
AcMapQueryPE
AcMapGeometryPE
class inheritance.

My custom objects implements various custom attributes and I would like
to enable queries for any of them.
I believe it could be done with
AcMapQueryPE::getPropertyValue(
AcMapValue & val,
AcDbEntity * pEnt,
AcMapQueryPE::EPropType type
);

There is an enum AcMapQueryPE::EPropType::kAttributeTag which might be
usable, but how can I set what attribute/property exactly I want to
get?

The demo QueryPESample doesn't address this, and there is nothing on
the ADN site.

Does anyone know anything about this or have some pointers?

Thanks in advance.