System and Method for Interpreting Natural Language Commands with Compound Criteria

A command-processing server receives a natural language command from a user. The command-processing server has a set of domain command interpreters corresponding to different domains in which commands can be expressed, such as the domain of entertainment, or the domain of travel. Some or all of the domain command interpreters recognize user commands having a verbal prefix, an optional pre-filter, an object, and an optional post-filter; the pre- and post-filters may be compounded expressions involving multiple atomic filters. Different developers may independently specify the domain command interpreters and the sub-structure interpreters on which they are based.