[QA] C2KB sub experiment takes all Meaning instances into account, including properties

[MichaelRoeder]

Problem

The GERBIL QA paper describes the C2KB task to take all resources into account. The running example clarifies, that it only takes entities into account. However, in the code, properties are taken into account as well.

The problem stems from the class hierarchy. C2KB looks for instances of Meaning. However, a question has Annotation instances for entities and Property instances for properties. The latter are a subclass of the Annotation.

Solution

• The filtering process for C2KB as sub task of QA has to remove all instances of Property from the list of markings.