A collection of Parameter objects, which are parameters for a
This collection is read-only. A particular instance of a command relationship may not specify all possible parameters. For example, the command relationship "Increase salaries by raise amounts" contains two parameters: salaries and raise amounts. If a user says, "Increase Sue's salary by $1000", the resulting DomainCmd object contains both parameters. However, if a user says, "Increase Sue's salary", the DomainCmd has only one parameter, and "Increase the salaries" has no parameters.