1. SDLIP: Simple Digital Library Interoperability Protocol
Delivering Queries, Receiving Results

2. Simple Search Over DL Collections
Content: Easy-to-adapt, basic protocol for searching digital collections
Purpose: Help DLI2 participants collaborate. Potentially impact larger DL community
Strategy:
Study past protocols
Construct initial specification
Involve InterLib community + IETF
Final specification
InterLib sites implement protocol
Disseminate to interested parties

3. But lets you say what you’re using
Initial Goals
Trivial to implement!
Works over CORBA/COM, HTTP, straight TCP/IP
Does not prescribe query format
Does not prescribe result format
Small footprint (Desktop/Laptop/PDA)
Allows for stateful or stateless operation
But lets you say what you’re using

4. Delivering Search Capability
Local Interface-1
Local Interface-2
Local Interface-n
Network boundary
InterLib Collection
SDLIP
External Protocol
Information Client
Thin InterLib Wrapper

5. Interface Consists of Four Components
InterLib Wrapper
Result Access Interface
Source Metadata Interface
Search Interface
Information
Client
Delivery Interface

6. Synchronous Search 2 Result Access Interface Information
InterLib Wrapper
Result Access Interface
Source Metadata Interface
Search Interface
Information
Client 1
Logically: wrapper presents an ordered result set

7. Status of Protocol
Documentation available at
Clients for CORBA and HTTP for Unix/Win via Java, and for PalmPilot
Data sources: California Digital Library Collections, UC Berkeley Melvyl, SDSC Metadata server, Dienst (NCSTRL), IMDB via Web, Z39.50 services (e.g. Library of Congress)
Columbia University working on source metadata interface
Implementations by: Arturo Crespo, John Huang, Ray Larson, Bertram Ludaescher, Sergey Melnik, Sriram Raghavan

8. Current Set of Operations
Search
search()
Operation request deliverable via any transport: CORBA/COM, HTTP, sockets.
Result access
getSessionInfo()
getDocs()
extendStateTimeout()
cancelRequest()
Source metadata
getInterface()
getSubcollectionInfo()
getPropertyInfo()