The end of Subsection Input Variables (5.2.5) mentions testing if a variable has been set and refers to Subsection 6.7.5 (Transducer output with variables): it should refer to Subsection 6.9.1 (Testing variables), which documents this topic. The reference to section-variables should be replaced by a reference to Subsection 6.9.1.
The end of Subsection Input Variables (5.2.5) mentions testing if a variable has been set and refers to Subsection 6.7.5 (Transducer output with variables): it should refer to Subsection 6.9.1 (Testing variables), which documents this topic. The reference to
section-variablesshould be replaced by a reference to Subsection 6.9.1.