Presentation on theme: "The Data Dictionary Norman Paskin, International DOI Foundation ELECTRONIC COMMUNICATION OF LICENCE TERMS."— Presentation transcript:
The Data Dictionary Norman Paskin, International DOI Foundation ELECTRONIC COMMUNICATION OF LICENCE TERMS
: Interoperability of Data in E-Commerce Systems: Focus: generic intellectual property and how to make data about it interoperable EC + groups from the content, author, creator, library, publisher and rights communities Pioneered a model of event-based metadata as a solution for integrating rights. –For e-commerce read automation Influenced by CIS and FRBR: –1995+ : Common Information System CIS (CISAC) – music rights –1998: Functional Requirements of Bibliographic Records FRBR (IFLA) – library cataloguing Has been used and developed further
doi> Why do we need a data dictionary? Theres lots of metadata already –Which should be (re-) used People use different schemes –So we need to map from one scheme to another Data (identifiers, metadata) assigned in one context or scheme may be encountered, and may be re-used, in another place (or time or scheme) - without consulting the assigner. You cant assume that your assumptions will be known to someone else. –Interoperability = the possibility of use in services outside the direct control of the issuing assigner –This is a prerequisite for communication (of rights terms or anything else) Does owner in scheme A mean owner in scheme B? –We need to map meanings –A prerequisite for extensibility
doi> What is a data dictionary? A set of terms, with their definitions used in a computerized system Some data dictionaries are structured, with terms related to other terms through hierarchies and other relationships: structured data dictionaries are derived from ontologies. An ontology combines a data dictionary with a logical data model, providing a consistent and logical world view. An interoperable data dictionary contains terms from multiple computerized systems or metadata schemes, and shows the relationships they have with one another in a formal way. The purpose of an interoperable data dictionary is to support the use together of terms from different systems. Indecs DD is structured (ontology based) and interoperable
Metadata scheme e.g. ONIX Metadata scheme e.g. SCORM Agreed term-by- term mapping or Crosswalk
Metadata scheme e.g. ONIX Metadata scheme e.g. SCORM
Data Dictionary Metadata scheme e.g. ONIX Metadata scheme e.g. SCORM ONIX:Author = NormanRights:Writer Metadata Scheme NormanRights Term Author Term Writer
Metadata interoperability: semantic problems But such mappings are not simple: Different names (and languages) for the same thing (journal_article vs SerialArticleWork) Same name for different things (title, Title) Data elements at different levels of speciality (title vs FullTitle, AlternativeTitle). Different allowed values for elements (pii vs not pii) Data at different levels of granularity (journal_article vs SerialArticleWork/SerialArticleVersion). Data in different structures (article as attribute of journal or vice versa). Data from different sources (local codes vs ONIX codes). Different contextual meaning (DOI of what…?) Different representation (1 title vs n titles). Different mandatory requirements (ISSN mandatory vs optional) Schemas are being updated all the time..... etc. Requires a coherent structured approach. doi>
So how do we make sense of this? Data dictionary uses an ontology An explicit formal specification of how to represent the objects, concepts and other entities that are assumed to exist in some area of interest and the relationships that hold among them Because relationships can be complex
The dictionary model doi> The methodology is the one (as developed in more detail for the MPEG RDD) This has also been developed further (OntologyX) It uses the context model – i.e. events based (a common ontology approach) We think of metadata as thing or people based. – static views e.g. about creation B But then how do we link things, e.g. to describe rights activities? By describing events; relating things and people – dynamic views e.g. A created B Events description is also the key to rights metadata – all rights transactions are events
The dictionary model doi> Agent PlaceTime Resource
The dictionary model doi> Agent PlaceTime Resource Norman Paskin London BICNISO.ppt
The dictionary model doi> Agent PlaceTime Resource Event: Norman Paskin presented ppt in London on 2 Dec 2004
Building views of metadata… Q: This isnt how I think of my metadata!..its just a series of things about something. How does this more complex approach fit what I have? A: This is simply a deeper view for the purposes of analysis.. You dont need to change your own approach. The events view builds from the simple things about view:
1. attribute view – simplest, most direct: things about… isbn Author S Pinker (values may be strings, IDs etc) entityattribute Building views of metadata…
2. association or relationship view – richer, more indirect: book hasTitle Words & Rules treats attributes as defined entities and others e.g. book hasAuthor Stephen Pinker allows multiple occurrences relationshipentity Building views of metadata…
3. context view – richest, most indirect publishingEvent hasAgentType publisher Weidenfeld publishingEvent hasResourceType book publishingEvent hasTimeType dateOfPublication 2002 publishingEvent hasPlaceType placeOfPublication UK Analysis moves from attribution to attribution process (Event) Most efficient handling of complex multiple metadata e.g. a rights catalogue (all rights transactions are events) Allows analysis of complex relationships and meaning agent context resource timeplace Building views of metadata…
An ontology approach uses the deeper view of metadata entityattribute Attribute (static view) relationshipentity Relationship agent context resource timeplace Context (dynamic view) Three levels of attribution, moving from simple (static) to richer (dynamic events):
Tested iDD has a long history and is used in several major activities. Built using methodology from the framework Used as the basis for DOI data model Used as basis for the MPEG-21 Rights Data Dictionary (RDD) Heavily influenced the current development of messaging systems for the publishing industry (ONIX) and music industry (MI3P). Methodology has been validated against the W3C ontology language OWL-DL Methodology for constructing interoperable Data Dictionaries which underlies iDD is in use commercially (Ontologyx). The International DOI Foundation (IDF) and EDItEUR intend to harmonise ONIX and DOI metadata through the use of this common data dictionary –and welcome collaboration with others adopting a similar approach
Neutral as to business model The semantic analysis underlying the iDD is independent of any implementation model. It was fundamental to indecs (despite e-commerce in its name) that it had no inherent commercial model, and it remains so for all the work that has followed it. It is just as critical to be able to say "this is not subject to copyright" as to say the opposite; –any "non-commercial" person or organization has is to be able to state that something is freely available and under what circumstances. A broad ontology, supporting rights expressions, must be able to support any kind of expression of any kind of right, agreement or licence or any terms (or none). Most organizations have the need for both freedom and protection of intellectual property in different contexts. –The iDD is not solely a tool for intellectual property as commercial property but is neutral as to the intellectual property regime being used.
Does not mandate one metadata scheme The aim of the iDD is to facilitate mapping between schemes The more precise the input, the more precise the output –e.g. a mapping from simple DC to SCORM will of necessity be lossy Some uses will set minimum standards –e.g. DOI Registration Agencies have rules that must be followed in the DOI application to ensure that the metadata can be mapped into the iDD to declare Application Profiles Any user is otherwise free to use their own metadata schemes for gathering, storing or disseminating metadata. iDD facilitates input and output to others schemes = semantic interoperability
Provides authority Every term entered into the iDD carries information on its status as to origin and mapping agreement If reciprocally agreed, then can be an assured mapping –which will enable users of the dictionary to interpolate mappings from their own schemes, through iDD, to scheme A and know that this will be considered authoritative by scheme A.. Anyone contributing terms to the iDD can specify who is allowed to see or specify their own terms. Some terms will be accessible to all: –e.g. ONIX, some kernel DOI terms, and the MPEG21 RDD.
Construction Based on DD methodology and Contextual Ontologyx Architecture tools, terms from various sources (ONIX, RDD, DOI) …But users need not understand the underlying concepts and construction of the iDD. –It is no more a requirement to know the details than it is for the designer of a web page to read all the underlying internet protocol RFCs. A fundamental role of the IDF and others with the iDD is to provide assurance to users that the work has been peer- reviewed and tested, and make available tools. Some key features are: –Extensible and granular to whatever level of detail is required. –Multiple, different, specialized views are available: these include a Rights Model, based on a set of specialized Contexts. –Local terms: local (internal) data elements and names can be added into the ontology –External terms: incorporates external and standard schemes such ISO territory, currency and language codes, and sector specific external schemes
Use Current use of the dictionary is on a project–by-project basis using technical consultancy An automated web based look-up system for the Dictionary is under development for IDF use (and potentially others e.g. RDD) Access will be granular: those with authority to access the Dictionary able to view what is appropriate – private terms are kept confidential.
iDD and the MPEG Rights Data Dictionary (RDD) ISO MPEG-21 Rights Data Dictionary is another notable data dictionary built on similar principles. –The MPEG Rights Data Dictionary provides semantic interoperability for use of rights expression languages and other tools. Derives from work funded by IDF and others using the same methodology as the iDD, so closely related and fully integrated. All terms in the RDD are mapped into the iDD; –RDD is one of the authorities specifying terms within iDD. –RDD is therefore at present a sub set of iDD. –Some future RDD terms might be added to the RDD which are not within iDD; the two Data Dictionaries would then overlap and share some common terms. The MPEG 21 RDD requirements in terms of management and availability for MPEG use are very similar to those of the iDD in relation to DOI implementation. –IDF is to be the Registration Authority for the MPEG-21 RDD, and will subcontract management of the RDD and iDD to Ontologyx.
OntologyX RightsCom (Mi3p etc) indecsDD IDF + ONIX Development of Black = what Red = who indecs (2000) EC plus many others: indecs Framework IFPI/RIAA, MPA, IDF, DentsuMMG, Rightscom: methodology for DD CONTECS (2001+) 2004 ISO MPEG21 RDD IDF is authority Data dictionaries
The Data Dictionary Norman Paskin, International DOI Foundation ELECTRONIC COMMUNICATION OF LICENCE TERMS