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DC-GENERAL  December 1997

DC-GENERAL December 1997

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Subject:

Re: new draft of DC basic elements

From:

Lorcan Dempsey <[log in to unmask]>

Reply-To:

dc-general

Date:

Sun, 21 Dec 1997 09:49:23 +0000 (GMT)

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (334 lines)



Grateful to know what the status of this doc is now. Is it still open for
comment in the light of other ongoing discussion.

Lorcan



On Mon, 27 Oct 1997, John A. Kunze wrote:

> Date: Mon, 27 Oct 1997 15:24:40 -0800 (PST)
> From: "John A. Kunze" <[log in to unmask]>
> To: [log in to unmask]
> Subject: new draft of DC basic elements
> 
> Please review this new draft of the Dublin Core element descriptions.
> It's been revised in accordance with understandings reached in Helsinki
> and is ready for discussion and comments on the meta2 list.
> 
> The aim is to iron out details (the Finnish Finish?) of the basic element
> semantics, publish a new Internet-Draft, and issue a final call for
> comments before forwarding it to the Internet Engineering Steering Group
> (IESG) with a recommendation to publish it as an internet informational RFC.
> 
> -John
> 
> PS.  There were too many small changes for a "diffs" file (detailing the
> differences) to be meaningful, but all changes were in sections 2.5 and 3.
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> John A. Kunze                   +1 415-502-6660    Mgr, Advanced Tech Group
> 530 Parnassus Ave, Box 0840     [log in to unmask]    Library and Center for
> San Francisco, CA  94143-0840   Fax: 415-476-4653    Knowledge Management
> =-=-=-=-=-=-=-=   University of California, San Francisco   =-=-=-=-=-=-=-=
> 
> 
> Dublin Core Workshop Series                                     S. Weibel
> Internet-Draft                                                   J. Kunze
> draft-kunze-dc-02.txt                                           C. Lagoze
> 27 October 1997
> Expires in six months
> 
> 
>           Dublin Core Metadata for Simple Resource Discovery
> 
> 
> 1. Status of this Document
> 
> This document is an Internet-Draft.  Internet-Drafts are working
> documents of the Internet Engineering Task Force (IETF), its areas, and
> its working groups.  Note that other groups may also distribute working
> documents as Internet-Drafts.
> 
> Internet-Drafts are draft documents valid for a maximum of six months
> and may be updated, replaced, or obsoleted by other documents at any
> time.  It is inappropriate to use Internet-Drafts as reference
> material or to cite them other than as ``work in progress.''
> 
> To learn the current status of any Internet-Draft, please check the
> ``1id-abstracts.txt'' listing contained in the Internet-Drafts Shadow
> Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe),
> munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
> ftp.isi.edu (US West Coast).
> 
> Distribution of this document is unlimited.  Please send comments
> to [log in to unmask], or to the discussion list [log in to unmask]
> 
> 
> 2. Introduction
> 
> Finding relevant information on the World Wide Web has become
> increasingly problematic in proportion to the explosive growth of
> networked resources.  Current Web indexing evolved rapidly to fill the
> demand for resource discovery tools, but that indexing, while useful,
> is a poor substitute for richer varieties of resource description.
> 
> An invitational workshop held in March of 1995 brought together
> librarians, digital library researchers, and text-markup specialists
> to address the problem of resource discovery for networked resources.
> This activity evolved into a series of related workshops and ancillary
> activities that have become known collectively as the Dublin Core Metadata
> Workshop Series.  
> 
> The goals that motivate the Dublin Core effort are:
> 
>     - Simplicity of creation and maintenance
>     - Commonly understood semantics
>     - International scope and applicability
>     - Extensibility
>     - Interoperability among collections and indexing systems
> 
> These requirements work at cross purposes to some degree, but all are
> desirable goals.  Much of the effort of the Workshop Series has been
> directed at minimizing the tensions among these goals.
> 
> One of the primary deliverables of this effort is a set of elements
> that are judged by the collective participants of these workshops
> to be the core elements for cross-disciplinary resource discovery.
> The term ``Dublin Core'' applies to this core of descriptive elements.
> 
> Early experience with Dublin Core deployment has made clear the need
> to support additional qualification of elements for some applications.
> Thus, Dublin Core elements may be expressed in simple unqualified ways
> that minimal discovery and retrieval tools can use, or they may be
> expressed with additional structure to support semantics-sharpening
> qualifiers that minimal tools can safely ignore but that more complex
> tools can employ to increase discovery precision.
> 
> The broad agreements about syntax and semantics that have emerged from
> the workshop series will be expressed in a series of five Informational
> RFCs, of which this document is the first.  These RFCs (currently they
> are Internet-Drafts) will comprise the following documents.
> 
> 2.1. Dublin Core Metadata for Simple Resource Discovery
> 
> An introduction to the Dublin Core and a description of the intended
> semantics of the 15-element Dublin Core element set without qualifiers.
> This is the present document.
> 
> 2.2. Encoding Dublin Core Metadata in HTML  
> 
> A formal description of the convention for embedding unqualified Dublin
> Core metadata in HTML.
> 
> 2.3. Qualified Dublin Core Metadata for Simple Resource Discovery
> 
> The principles of element qualification and the semantics of Dublin Core
> metadata when expressed with a recommended qualifier set known as the
> Canberra Qualifiers.
> 
> 2.4. Encoding Qualified Dublin Core Metadata in HTML 
> 
> A formal description of the convention for embedding qualified Dublin
> Core metadata in HTML.
> 
> 2.5. Dublin Core on the Web:  RDF Compliance and DC Extensions
> 
> A formal description for encoding Dublin Core metadata with qualifiers
> in RDF compliant metadata, and how to extend the core element set.
> 
> 
> 3. Description of Dublin Core Elements  
> 
> The following is the reference definition of the Dublin Core Metadata
> Element Set.  It is expected that practice will evolve to include
> qualifiers for certain of the elements.  The reference description of
> the elements resides at [1]:
> 
> 	http://purl.org/metadata/dublin_core_elements
> 
> Note that elements have a descriptive name intended to convey a common
> semantic understanding of the element.  To promote global interoperability,
> a number of the element descriptions suggest a controlled vocabulary for
> the respective element values.  It is assumed that other controlled
> vocabularies will be developed for interoperability within certain local
> domains.  Further note that each element is optional and repeatable.
> 
> In the element descriptions below, a formal single-word label is specified
> to make the syntactic specification of elements simpler for encoding schemes.
> Although some environments, such as HTML, are not case-sensitive, it is
> recommended best practice always to adhere to the case conventions in the
> element names given below to avoid conflicts in the event that the metadata
> is subsequently converted to a case-sensitive environment, such as XML/RDF.
> 
> 3.1. Title				Label: "Title"
> 
>      The name given to the resource by the Creator or Publisher.
> 
> 3.2. Author or Creator			Label: "Creator"
> 
>      The person or organization primarily responsible for creating
>      the intellectual content of the resource.  For example, authors
>      in the case of written documents, artists, photographers,
>      or illustrators in the case of visual resources.
> 
> 3.3. Subject and Keywords		Label: "Subject"
> 
>      The topic of the resource.  Typically, subject will be expressed
>      as keywords or phrases that describe the subject or content of the
>      resource.  The use of controlled vocabularies and formal
>      classification schemes is encouraged.
>    
> 3.4. Description			Label: "Description"
> 
>      A textual description of the content of the resource, including
>      abstracts in the case of document-like objects or content
>      descriptions in the case of visual resources. 
>      
> 3.5. Publisher				Label: "Publisher"
> 
>      The entity responsible for making the resource available in its
>      present form, such as a publishing house, a university department,
>      or a corporate entity.   
>      
> 3.6. Other Contributor 			Label: "Contributor"
> 
>      A person or organization not specified in a Creator element who
>      has made significant intellectual contributions to the resource
>      but whose contribution is secondary to any person or organization
>      specified in a Creator element (for example, editor, transcriber,
>      and illustrator).
>      
> 3.7. Date				Label: "Date"
> 
>      A date associated with the creation or availability of the resource.
>      Such a date is not to be confused with one belonging in the Coverage
>      element, which would be associated with the resource only insofar as
>      the intellectual content is somehow about that date.  Recommended
>      best practice is defined in a profile of ISO 8601 [2] that includes
>      (among others) dates of the forms YYYY and YYYY-MM-DD.  In this scheme,
>      for example, the date 1994-11-05 corresponds to November 5, 1994.
> 
> 3.8. Resource Type 			Label: "Type"
> 
>      The category of the resource, such as home page, novel, poem,
>      working paper, technical report, essay, dictionary.  For the sake
>      of interoperability, Type should be selected from an enumerated
>      list that is currently under development in the workshop series.
>  
> 3.9. Format  				Label: "Format"
> 
>      The data format of the resource, used to identify the software
>      and possibly hardware that might be needed to display or operate
>      the resource.  For the sake of interoperability, Format should be
>      selected from an enumerated list that is currently under development
>      in the workshop series.
> 
> 3.10. Resource Identifier 		Label: "Identifier"
> 
>      A string or number used to uniquely identify the resource.  Examples
>      for networked resources include URLs and URNs (when implemented).
>      Other globally-unique identifiers, such as International Standard
>      Book Numbers (ISBN) or other formal names are also candidates
>      for this element.
> 
> 3.11. Source				Label: "Source"
> 
>      Information about a second resource from which this resource is
>      derived.  This element may contain a date, format, identifier, or
>      other information pertaining to the second resource.  This element
>      is not applicable for a resource that appears in its original form.
>      It may be desirable to have a separate metadata package for the
>      second resource; in that case, use of the Relation element is
>      recommended.
> 
> 3.12. Language 				Label: "Language"
> 
>      The language of the intellectual content of the resource.
>      Where practical, the content of this field should coincide with
>      RFC 1766 [3]; examples include en, de, es, fi, fr, ja, th, and zh.
> 
> 3.13. Relation				Label: "Relation"
> 
>      An identifier of a second resource and its relationship to this
>      resource.  This element is a means of linking separate metadata
>      packages of related resources.  Examples include a translation of
>      a work, a chapter of a book, or a mechanical transformation.
>      For the sake of interoperability, relationships should be selected
>      from an enumerated list that is currently under development in the
>      workshop series.
> 
> 3.14. Coverage				Label: "Coverage"
> 
>      The spatial and/or temporal characteristics of the intellectual content
>      of the resource.  Any date in this element is concerned with what the
>      resource is about rather than when it was created or made available, the
>      latter belonging in the Date element.  Formal specification of Coverage
>      is currently under development.
> 
> 3.15. Rights Management			Label: "Rights"
> 
>      A rights management statement, an identifier that links to a
>      rights management statement, or an identifier that links a service
>      providing information about rights management for the resource.
> 
> 
> 4. Security Considerations
> 
> The Dublin Core element set poses no risk to computers and networks.
> It poses minimal risk to searchers who obtain incorrect or private
> information due to careless mapping from rich data descriptions to
> simple Dublin Core scheme.  No other security concerns are likely
> to be raised by the element description consensus documented here.
> 
> 
> 5. References
> 
>    [1] Dublin Core Metadata Element Set: Reference Description,
>        http://purl.org/metadata/dublin_core_elements
>        
>    [2] ISO 8601 Profile for the Dublin Core,
>        http://purl.org/metadata/dublin_core_date_formats
> 
>    [3] RFC 1766, Tags for the Identification of Languages,
>        http://ds.internic.net/rfc/rfc1766.txt  language tags
> 
> 7. Authors' Addresses
> 
> Stuart L. Weibel
> OCLC Online Computer Library Center, Inc.
> Office of Research
> 6565 Frantz Rd.
> Dublin, Ohio, 43017, USA
> Email: [log in to unmask]
> Voice: +1 614-764-6081
> Fax:   +1 614-764-2344
> 
> John A. Kunze
> Center for Knowledge Management
> University of California, San Francisco
> 530 Parnassus Ave, Box 0840
> San Francisco, CA  94143-0840, USA
> Email: [log in to unmask]
> Voice: +1 415-502-6660
> Fax:   +1 415-476-4653
> 
> Carl Lagoze
> Digital Library Research Group
> Department of Computer Science
> Cornell University
> Ithaca, NY  14853, USA
> Email: [log in to unmask]
> Voice: +1-607-255-6046
> Fax:   +1-607-255-4428
> 
> 

Lorcan Dempsey          <URL:http://www.ukoln.ac.uk/~lisld/>
----------------------  -----------------------------------------------
ph: +44 (0)1225 826254  UKOLN (UK Office for Library & Info Networking)
fx: +44 (0)1225 826838  University of Bath, Bath BA2 7AY, UK

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