collection service. 19 february 2001cyclades kick-off meeting collection a set of documents a set of...
TRANSCRIPT
Collection Service
19 February 2001 CYCLADES Kick-off meeting
Collection
A set of documentsA set of services on the documents A set of polices that regulate the use of
the services
19 February 2001 CYCLADES Kick-off meeting
Why a dynamic collection functionality?
The Cyclades data environment will be huge and heterogeneous
The dynamic collection functionality will provide
a user view of the data environment as organised into community meaningful information spaces accessible throught specific set of services
19 February 2001 CYCLADES Kick-off meeting
User View
Collection descriptions
documents in “computer science” domain
documents in “physics” domain stored in ArXiv and PhysNet, published after 1990
…….
Collection names
Computer Science
Recent Physics
…….
19 February 2001 CYCLADES Kick-off meeting
User view
European Computer Science attribute-based search, cross-language search, …
Computer Science simple-search, …
Collection names Operations
simple-search
Input: “keywords in the abstract”
Preconditions: keywords in English
Output:set of <document.id,author,title>
Effect:”returns the specified output for all the documents that contains the given keywords in their abstract”
19 February 2001 CYCLADES Kick-off meeting
Why a dynamic collection functionality?
The dynamic collection mechanism will provide
a support for the optimisation of the services
19 February 2001 CYCLADES Kick-off meeting
Architecture
Create.coll(criterion)
Remove.coll(coll.name)
Collection Server Get.collection.descriptio
n (coll.name)
List.collections
19 February 2001 CYCLADES Kick-off meeting
Collection server
Collection descriptive metadata
Relation between collection and system descriptive metadata
System descriptive metadata
List of available collectionsFor each collection:
name, subject, description, signature and effect of services, access polices
List of metadata repositories, indexes,… and their address
For each metadata repository:
Subject, percentage accessible digital documents, language, …..
Mapping between metadata repositories and indexes
Search, Browse specifications
….
19 February 2001 CYCLADES Kick-off meeting
Dynamic creation
Admissible criteria
Those documents and those services that are relevant for the new identified community
19 February 2001 CYCLADES Kick-off meeting
Dynamic creation
• Admissible criteria - initial assumption
d d / (C1, C2, …,Cn) P(d)
Composition Selection of existing
collections
Restriction on the document
metadata fields
19 February 2001 CYCLADES Kick-off meeting
“system driven” criterion formulation
The user interface presents the possible options and their description
List of available collections and their description
Composition operators Indexed metadata fields for the documents
that belong to the chosen composition
Services and polices are automatically derived
19 February 2001 CYCLADES Kick-off meeting
Time 0 options
List of available collections Cyclades selected archives
Description of each collectionDerived by the answers to the OAI protocol requests +
…..?
Restriction fieldsDC + indexed fields of parallel metadata formats
ServicesCyclades services on the selected documents
19 February 2001 CYCLADES Kick-off meeting
This is the end of the story
19 February 2001 CYCLADES Kick-off meeting
Create collection
•Criterion specification:
– Selection of existing collections
– Composition of existing collections
– Restriction
19 February 2001 CYCLADES Kick-off meeting
Abstract collection metadata
• Polices description– ????
19 February 2001 CYCLADES Kick-off meeting
The collection criteria
Selection of one or more existing collections “Technical reports”
Composition of existing collections “Health” and “Information technology”
Restriction “Tecnical reports” on medicine, written in Italian, and available in
downloadable digital form “Theses and dissertations” produced by students at Virgina Tech
19 February 2001 CYCLADES Kick-off meeting
Other collection criteria
• plus others….
19 February 2001 CYCLADES Kick-off meeting
Implementable criterion
The given collection specification (criterion) must be implementableSelection must operate on existing collections(which can be mapped into ….Restriction must specify condition that can be evaluated on the collection/collection composition e.g. Theses of the “Virginia Tech collection”
Set of services/polices must be defined on the set of collection documents
e.g.Search by author last name