4. The method of claim 1 , further comprising: creating a presentation control instruction that includes a presentation action identifier and one or more optional parameters; and selecting a classified structural element includes selecting a classified structural element in dependence upon the presentation action identifier and the parameters.
4. The method of claim 1 , further comprising: creating a presentation control instruction that includes a presentation action identifier and one or more optional parameters; and selecting a classified structural element includes selecting a classified structural element in dependence upon the presentation action identifier and the parameters. 5. The method of claim 4 further comprising: receiving from a user participating in the presentation a key phrase and optional parameters for invoking a presentation action; and parsing the key phrase and parameters against a voice response grammar into the presentation control instruction.