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The Eprints Application Profile: a FRBR approach to modelling repository meta...Julie Allinson
Julie Allinson, Pete Johnston and Andy Powell, UKOLN, University of Bath, present recent work on developing a Dublin Core Application Profile (DCAP) for describing "scholarly publications" (eprints). They will explain why the Dublin Core Abstract Model is well suited to creating descriptions based on entity-relational models such as the FRBR-based (Functional Requirements for Bibliographic Records) Eprints data model. The ePrints DCAP highlights the relational nature of the model underpinning Dublin Core and illustrates that the Dublin Core Abstract Model can support the representation of complex data describing multiple entities and their relationships.
An introduction to a dublin core application profile for describing scholarly works. Presented at the JISC Repositories and Preservation Programme Meeting, 5th July 2007, London. Julie Allinson, Repositories Research Officer, UKOLN, University of Bath.
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FRBR: A Generalized Approach to Dublin Core Application Profiles
1. FRBR:
A Generalized Approach
to
Dublin Core
Application Profiles
Maja Žumer
University of Ljubljana, Slovenia
Marcia Lei Zeng and Athena Salaba
Kent State University, USA
1
6. A Dublin Core Application Profiles is a document
(or set of documents) that specifies and describes
the metadata used in a particular application.
describes what a community wants to accomplish with
its application (Functional Requirements);
characterizes the types of things described by the
metadata and their relationships (Domain Model);
enumerates the metadata terms to be used and the rules
for their use (Description Set Profile and Usage
Guidelines); and
defines the machine syntax that will be used to encode
the data (Syntax Guidelines and Data Formats)
- Coyle and Baker, 2009. Guidelines for Dublin
Core Application Profiles
6
10. Domain Model of the
Scholarly Works Application
Profile
10(Allison, Johnston, and Powell. (2007). A Dublin Core Application Profile
for Scholarly Works.)
11. SWAP as interpretation of
FRBR
a ScholarlyWork is a FRBR Work
a Copy is a FRBR Item
Relationships redefined
Agent is added as super-class (FRBR Person or a
FRBR Corporate Body)
Agent-work relationships developed
Agent-expression relationships developed
subject” is an attribute of a ScholarlyWork.
11
14. The need for a general AP
model
Identification of parts
Subject relationships
More agent – group 1 relationships
Relationships on a general level
Intellectual property control on all
levels
14
20. Discussion
Is it possible to have one general
model?
Are all relationships covered?
Are any relationships unnecessary?
Verification on real examples…
20
21. Questions and Discussion?
FRBR:
A Generalized Approach
to
Dublin Core
Application Profiles
Maja Žumer
University of Ljubljana
Marcia Lei Zeng and Athena Salaba
Kent State University
21
Editor's Notes
The Guidelines for Dublin Core Application Profiles document provides a framework for the content and structure of any Dublin Core Application Profile (DCAP). The document explains the key components of a Dublin Core Application Profile and walks through the process of developing a profile. According to these guidelines, “[a] DCAP is a document (or set of documents) that specifies and describes the metadata used in a particular application. To accomplish this, a profile:
describes what a community wants to accomplish with its application (Functional Requirements);
characterizes the types of things described by the metadata and their relationships (Domain Model);
enumerates the metadata terms to be used and the rules for their use (Description Set Profile and Usage Guidelines); and
defines the machine syntax that will be used to encode the data (Syntax Guidelines and Data Formats)” (Coyle and Baker, 2009).
Several DCAPs have been developed throughout the years. The main points of reference for the review criteria applied to application profiles are the Singapore Framework for Dublin Core Application Profiles, the DC Abstract Model and a draft Description Set Profile specification (Mikael, 2008).
Here we introduce a few best-practice examples of application:
Dublin Core Collections Application Profile (DC-CAP), published in March 2007, specifies how to construct a DC metadata description set that provides a collection level description. It provides a means for creating simple descriptions of collections (i.e., aggregations of physical or digital resources), as well as simple descriptions of catalogues and indexes (i.e., aggregations of the metadata that describe the collections). It employs a simple entity-relationship model for collections and their relationships to other entities. The entities are:
Collection -- An aggregation of Items.
Item -- A physical or digital resource.
Location -- A place where a Collection is held.
Service -- A system that provides access to the Items within the Collection.
Catalogue or Index -- An aggregation of Items, which describes a Collection.
The DC Collections AP describes the use of properties to represent attributes of the Collection and of the Catalogue or Index as well as relationships between or among the entities Collection and Catalogue or Index. Another entity, Agent, is also presented in the context of the model but is not further defined (Dublin Core Collection Description Task Group, 2007).
The Scholarly Works Application Profile (SWAP) was developed in 2006 and reviewed by the DCMI Usage Board in 2009 in order to provide a method for describing scholarly works. A Scholarly Work is defined as a distinct intellectual or artistic scholarly creation. The model comprises of the following five entities:
Scholarly Work
Expression
Manifestation
Copy
Agent (Allison et al., 2007).
This application profile provides a way of describing these entities as part of a description set (a set of related DC descriptions). Details of this domain model will be discussed in Section 2 below.
The Images Application Profile (IAP), a DCAP, came out from the work undertaken within the JISC Digital Repositories programme (UK) for describing images held in institutional repositories. The research concluded that FRBR could be used quite successfully to model some image types, particularly those that are the product of an artistic or intellectual process. However, the group found that the Expression entity is not applicable to all types of images and therefore a decision was made to exclude Expression from IAP domain model. According to IAP, any change in an image produces a new Manifestation. The group considered the possible consequences as IAP merges with other related FRBR-based repository profiles (Images Application Profile, 2008).
DC-SWAP focuses on e-prints (including scholarly works, research papers or scholarly research texts), particularly for the purpose of repositories and aggregator services. In the initial stages, the DC-SWAP working group specified the goals of the application profile.
(Eprints Application Profile Functional Requirements Specification, 2006). At that time, FRAD and FRSAD were not developed yet.
As seen in Figure 2, the DC-SWAP model is based on FRBR with some modifications, particularly in labels for entities and relationships (Allison, et al., 2007).
According to the SWAP Application Model presented by Allison, et al. (2007), it can be summarized that SWAP has introduced the following changes to FRBR:
a ScholarlyWork is a FRBR Work
a Copy is a FRBR Item
an Agent is a FRBR Person or a FRBR Corporate Body
the ‘isExpressedAs’ relationship is known as ‘is realized through’ in FRBR
the ‘isManifestedAs’ relationship is known as ‘is embodied in’ in FRBR
the ‘isAvailableAs’ relationship is known as ‘is exemplified by’ in FRBR
the ‘isCreatedBy’ relationship is known as ‘is created by’ in FRBR
the ‘isPublishedBy’ relationship is modelled as the “publisher” attribute of a Manifestation in FRBR.
Some differences need to be pointed out:
All relationships are declared in both directions, left-to-right first. The arrows are indicating the cardinality of the relations, in line with FRBR conventions.
The most important change is the relationship between Expression and Manifestation: in addition to the obvious fact that any instance of Expression can be embodied in (‘isManifestedIn’) one or more Manifestations, we need to point out that any instance of Manifestation may embody one or more instances of Expressions. Examples of Manifestations embodying more Expressions include texts with illustrations, a journal issue, or any collection of articles. Here the relationship label has been changed from ‘isManifestedAs’ to ‘isManifestedIn’ to reflect the situation.
The ‘hasSubject’ relationship from Work to Thema is added. In SWAP “subject” is an attribute of a ScholarlyWork.
A general DCAP domain model is needed for ensuring the interoperability of all application profiles and metadata created using these APs. A general AP domain model will not cover all specific tasks or specific features of the different forms/genre/types of resources. These special needs are, and should be, taken care of in specific APs.
The General DCAP Domain Model (Figure 6) is proposed based on previous developments. In The General DCAP Domain Model, the relationships are declared on the most general level; any particular AP will then define more specific relationships, for example ‘isFundedBy’ could replace ‘isSupportedBy.’ Similarly the general ‘isCreatedBy’ can be refined as ‘isTranslatedBy’ (in the case of Expression) or ‘isPublishedBy’ for Manifestation.