Lexical derivation involves change in meaning; the semantics of the lexical derivatives differs from that of their base words.
There are two types of lexical derivation that are captured as such at the tectogrammatical level:
trojí (=three_kinds_of) is represented by tři (=three);
třetina (=(one) third) → tři;
třetí (=the_third) → tři.
Relative, indefinite, interrogative, negative and totalizing pronouns and pronominal numerals and adverbs of a similar type (e.g. někdo / nikdo (=somebody/nobody), několik (=several), někdy / nikdy (=sometimes/never)) are represented by the t-lemma of the corresponding interrogative or relative pronoun, numeral or adverb.
někdo (=somebody) is represented by kdo (=who);
nikdo (=nobody) → kdo;
nic (=nothing) → co (=what);
několik (=several) → kolik (=how_many);
všechen (=all) → co (=what);
žádný (=no) → který (=which).
The semantic feature distinguishing individual types of numerals from their cardinal counterparts is encoded in the value of their
numertype grammateme (see Section 5.5, "The
numertype grammateme"). The semantic feature distinguishing different types of pronominal numerals and adverbs from each other is encoded in the value of their
indeftype grammateme (see Section 5.6, "The
As for type A, the form of the m-lemma follows from the combination of the used t-lemma and the value of the
numertype grammateme (e.g. třetí (=the third) has the t-lemma tři (=three) and the value
ord is specified in the
numertype attribute). As for type B, the form of the m-lemma follows from the combination of the used t-lemma and the value of the
indeftype grammateme (e.g. the m-lemma někdo (=somebody) is represented by a node with the t-lemma kdo (=who) and the
indef1 value in the
!!! Only those types of lexical derivation are represented as such at the tectogrammatical level which are grammaticalized to a sufficiently large extent. Hence, we only represent those cases of lexical derivation as such that belong to a closed class of words (these are pronouns, numerals and pronominal adverbs). So far, productive types of lexical derivation (derivation of feminine forms from masculine forms, derivation of diminutives or agent nouns) are not represented as such in PDT.