2.6 Combinations of attribute constraints: Boolean expressions

• operators: & (and), | (or), ! (not), -> (implication, cf. Section 4.1)

  > [lemma="under.+" & pos="V.*"];
  $\to$ verb with prefix under...

• attribute/attribute-pairs: compare attributes as strings

  > [lemma="under.+" & (word!=lemma];
  $\to$ inflected forms of lemmas with prefix under...

• complex expressions: parentheses (round brackets) group conditions and control order of evaluation

  > [(lemma="go") & !(word="went"%c | word="gone"%c)];

• any expression in square brackets ([...]) describes a single token ( $\Rightarrow$ pattern)