On the tectogrammatical level, also the topic-focus articulation (TFA) is annotated. We consider TFA to be a phenomenon of the underlying structure of the sentence - two surface realizations of a sentence with differing TFA correspond to two different tectogrammatical trees.
TFA annotation comprises two phenomena:
contextual boundness (see Section 2, "Contextual boundness").
Contextual boundness is represented by the values of the attribute tfa for each node of the tectogrammatical tree.
communicative dynamism (see Section 3, "Communicative dynamism").
Communicative dynamism is represented by the underlying order of nodes.
Annotated trees therefore contain two types of information - on the one hand the value of contextual boundness of a node and its relative ordering with respect to its sister nodes reflects its function within the topic-focus articulation of the sentence, on the other hand the set of all the TFA values in the tree and the relative ordering of subtrees reflects the overall functional perspective of the sentence, and thus enables to distinguish in the sentence the complex categories of topic and focus (however, these are not annotated explicitly).