10.2 Derived Procedures
For some procedures, a formal definition in the expression language is supplied. These formal definitions do not handle errors. A correct implementation would need first to verify that arguments meet the requirements indicated by the procedure prototypes and the procedure description.
10.2.1 HyTime Support
10.2.2 List Operations
10.2.3 Generic Property Operations
10.2.4 Core Query Language
10.2.5 SGML Property Operations