The action taken when condition of a rule is matched. One from: validate, reject, allow, attach, unwrap, cancelNestedActions, or attachPlaceholder element within an NVDL script

A number of sections which are joined (often by using attach) for dispatching to a validator

A mapping from namespace to actions. The more powerful of two ways of partitioning an instance into sections

An XML file valid to the NVDL schema. May also be called a schema since it is used for validation

An element such that a single namespace name applies to itself and all descendant elements