DocumentMetadata
Collection1
AdvancedFormQuery
Collection2
Servlet
Receptionist
Query
Page
Document
Browse
Applet
MessageRouter
TextQuery
DocumentStructure
DocumentContent
ClassifierBrowse
FormQuery
ClassifierBrowseMetadata
TextQuery
DocumentStructure
DocumentContent
DocumentMetadata
Network of modules
Synchronous xml communication
Describe yourself mandatory
Protocol open ended
Every module can apply xslt
Dynamic addition of services