We assume that each complete sentence divides from the point of view into two complex categories:
topic (see Section 5.1, "Topic"),
focus (see Section 5.2, "Focus").
The complex categories of topic and focus are not annotated explicitly in the tectogrammatical trees, we however suppose that they can be deduced from them. Below we describe a hypothesized procedure for determining the topic and focus based on annotated tectogrammatical trees.