In the Grove Paradigm...
Vocabulary-specific engines can be plugged together in applications that support XML resources that use multiple vocabularies.
Vocabulary-specific engines generate a "grove" (object graph with relevant Property Set as schema) from any vocabulary-conforming XML instance.
Vocabulary-specific engines can mature and offer reliable semantic validation and processing services in a variety of application contexts, instead of being rebuilt in each application.
Time and cost of developing applications is reduced, while reliability of information interchange increases.