Content Source Description
Introduction
The Content Source Description (CSD) is a digital libarary service that supports the execution of content-based queries against a number of content sources (such as collections) that are associated with DILIGENT indices.
Implementation Overview
Among the many possible ways of implementing a content source description service, the provided reference CSD service is based on the representation of text sources as term histograms. A histogram basically contains the most representative words and phrases of a content source (i.e. a content collection) together with statistics information. To obtain these statistics, the reference CSD service interacts with index services in order to derive statistical information from full-text DILIGENT indices of internal sources and to subscribe for notifications should these indices change (notifications will be available in the beta-release of the project).
The CSD service operatates on a number of underlying component packages that provide a corse-grained division of functionality:
- Core: This package groups components responsible for generating and exposing content source descriptions.
- Handlers: Handlers are used to specify the of generic and possibly stateful processors of the Content Source Description service. This includes the task of description generation and the publication of generated descriptions.
- Notification: This package groups components that are responsible for monitoring external changes which are relevant to content source descriptions and for reflecting those changes onto the related descriptions in accordance with their update policies.
Dependencies
- Java JDK 1.5
- WS-Core
- DiligentProvider
- KXML (version 2.3.0)
- Contentmanagement
- DIRCommons library
- Indexservice Generatorservice
- Indexservice Lookupservice
- DISHL client
- DISIP
