set function-library of external-function function-name to string-expression

This action assigns the name of an external function library during the running of an OmniMark program.

The values used to set the external function library name can be constant string expressions, that are determined by program logic or derived from some input data. It's entirely up to the program.

An external function has to have a valid external function name and a valid function library name (unless it defaults) at the point of every call made to the function. These names can be changed at any time, and they take effect at the next call. This allows calls to be able to database access functions, for example, to rebound to a different database system during a run.