Dublin Core, OAIPMH and the eBank UK schema

1
Dublin Core, OAI-PMH and the eBank UK schema
eBank UK workshop on Chemistry schemas University
of Bath, 18th February 2005

• Monica Duke
• m.duke_at_ukoln.ac.uk
• UKOLN, University of Bath, UK
• http//www.ukoln.ac.uk/

UKOLN is supported by
2
Contents

• Whirlwind guide to DC
• DC abstract model
• Encoding in XML
• OAI-PMH and the eBank UK project
• eBank UK XML schema definition
• Crystallography suggestions

Note you are going to see some angle-brackets
3
Acknowledgement

• Andy Powell (UKOLN)
• For donation of slides
• Recommendation
• Dublin Core Conference Tutorials
• (Oct 04)
• http//www.ukoln.ac.uk/metadata/presentations/ecdl
  -2004/dc-tutorial/

4
Bluffers guide to DC
http//dublincore.org/

• DC short for Dublin Core
• simple metadata standard,supporting
  cross-domainresource discovery
• original focus on Web resources but that is no
  longer the case e.g. usage to describe physical
  artefacts in museums
• current usage across wide range of sectors
  academic, e-government, museums, libraries,
  business, semantic Web

5
Bluffers Guide to DC

• simple DC provides 15 elements (metadata
  properties)
• multiple encoding syntaxes including HTML ltmetagt
  tags, XML and RDF/XML (XML schema are available)

6
Bluffers Guide to DC

• relatively slow programme of adding new terms to
  qualified DC
• new elements (e.g. dctermsaudience)
• element refinements (e.g. dctermsdateCopyrighted)
  
• encoding schemes (e.g. dctermsLCSH and
  dctermsW3CDTF
• 48 elements and 17 encoding schemes

http//dublincore.org/documents/dcmi-terms/
7
Bluffers Guide to DC

• DC can be embedded into HTML pages but almost
  none of the big search engines will use it! Why?
  Lack of trust
• meta-spam
• meta-crap
• however, embedding DC in HTML may be worthwhile
  if your own site search engine uses it
• however, simple DC forms baseline metadata format
  for the OAI protocol.

8
Important DCMI documents

• DCMI Abstract Model DRAFThttp//www.ukoln.ac.uk
  /metadata/dcmi/abstract-model/
• Expressing Dublin Core in HTML/XHTML meta and
  link elementshttp//dublincore.org/documents/dcq-
  html/
• Guidelines for implementing Dublin Core in
  XMLhttp//dublincore.org/documents/dc-xml-guideli
  nes/
• Expressing Simple Dublin Core in
  RDF/XMLhttp//dublincore.org/documents/dcmes-xml/
  
• Expressing Qualified Dublin Core in
  RDF/XMLhttp//dublincore.org/documents/dcq-rdf-xm
  l/
• Namespace Policy for the DCMIhttp//dublincore.or
  g/documents/dcmi-namespace/
• DCMI Metadata Termshttp//dublincore.org/document
  s/dcmi-terms/

9
Abstract models for DC
10
Why an abstract model?

• Before we start creating DCMI descriptions we
  need to understand what kinds of things we want
  to say about resources
• the DCMI view of the world/resources we want to
  describe (the DCMI resource model)
• the DCMI view of the descriptions we make about
  that world (the DCMI description model)
• Known as the DCMI abstract model
• Simplified view presented here

11
(No Transcript)
12
What is a resource?

• W3C/IETF definition of resource is
• anything that has identity. Familiar examples
  include an electronic document, an image, a
  service (e.g., "today's weather report for Los
  Angeles"), and a collection of other resources.
  Not all resources are network "retrievable"
  e.g., human beings, corporations, and bound books
  in a library can also be considered resources.
• i.e. a resource is anything
• physical things (books, cars, people)
• digital things (Web pages, digital images)
• conceptual things (colours,points in time)

13
DC and resources

• but this seems to be too wide for the things we
  can describe with DC!
• can we really describe people using DC?
• do people have titles and subjects?
• no in general we only use DC to describe a
  sub-set of all resources
• anything covered by the DCMIType list
• Collection, Dataset, Event, Image (Still or
  Moving), Interactive Resource, Service, Software,
  Sound, Text, Physical Object

14
DCMI resource model

• each resource that we want to describe has zero
  or more properties
• a property is a specific aspect, characteristic,
  attribute or relation used to describe a resource
• each property has one or more values
• each value is a resource (the physical or
  conceptual entity that is associated with a
  property when it is used to describe a resource)

15
DCMI description model

• a description is made up of
• one or more statements (about one, and only one,
  resource) and
• zero or one resource URI (a URI reference that
  identifies the resource being described)
• each statement is made up of
• a property URI (that identifies a property),
• zero or one value URI (that identifies a value of
  the property),
• zero or one encoding scheme URI (that identifies
  the class of the value) and
• zero or more value representations of the value

16
DCMI description model (2)

• each property is an attribute of the resource
  being described
• each property URI may be repeated in multiple
  statements
• the value representation may take the form of a
  value string, a rich value or a related
  description
• Value string
• is a simple human-readable string
• May have an associated language (e.g.en-gb)

17
The 11 principle

• notice that the model indicates that each
  property used in a description must be an
  attribute of the resource being described
• this is commonly referred to as the 11 principle
  - the principle that a DCMI metadata description
  describes one, and only one, resource
• however

18
Description sets

• real-world metadata applications tend to be based
  on loosely grouped sets of descriptions (where
  the described resources are typically related in
  some way)
• known here as description sets
• for example, a description set might comprise
  descriptions of both a painting and the artist

19
DCMI records

• description sets are instantiated, for the
  purposes of exchange between software
  applications, in the form of metadata records
• each record conforms to one of the DCMI encoding
  guidelines (XHTML meta tags, XML, RDF/XML, etc.)

ltdctitlegt a document lt/dctitlegt ltdccreatorgt and
y powell lt/dccreatorgt
20
Model summary
21
Simple and qualified

• a simple DC record is a record that
• conforms to the abstract model,
• comprises only a single description,
• uses only the 15 properties in the Dublin Core
  Metadata Element Set,
• makes no use of value URIs, encoding schemes,
  rich values or related descriptions.

22
Simple and qualified DC

• a simple DC record is a record that
• conforms to the abstract model,
• comprises only a single description,
• uses only the 15 properties in the Dublin Core
  Metadata Element Set,
• makes no use of value URIs, encoding schemes,
  rich values or related descriptions.

23
Qualified DC model

• a qualified DC record is a record that
• conforms to the DCMI abstract model,
• contains at least one property taken from the
  DCMI Metadata Terms recommendation

24
A couple of notes

• everything in DC is optional
• Dumb-down
• the process of translating a qualified DC
  metadata record into a simple DC metadata record
• informed dumb-down
• uninformed dumb-down

25
Encoding DC in XML
26
DCMI recommendations

• For the full detailsGuidelines for
  implementing Dublin Core in XMLhttp//dublincore.
  org/documents/dc-xml-guidelines/
• nine recommendations for encoding DC in XML

27
General Recommendations

• implementers should base their XML applications
  on XML Schemas rather than XML DTDs
• Use of upper and lower case in property names and
  encoding schemes
• e.g. property names for the 15 DCMES elements
  should be lower-case ltdctitlegt

28
Properties and values

• implementers should encode properties as XML
  elements and values as the content of those
  elements
• the name of the XML element should be an XML
  qualified name (QName) of the propertyltdctitlegt
  Dublin Core in XMLlt/dctitlegt
• do not use constructs likeltdctitle
  value"Dublin Core in XML" /gt

29
Repeating Properties

• multiple value strings should be encoded by
  repeating the XML element for that
  propertyltdctitlegtFirst titlelt/dctitlegt
  ltdctitlegtSecond titlelt/dctitlegt

30
Value String language

• where the language of the value is indicated, it
  should be encoded using the xmllang
  attributeltdcsubject xmllang"en"gt
  seafoodlt/dcsubjectgtltdcsubject xmllang"fr"gt
  fruits de merlt/dcsubjectgt

31
Container elements

• note that it is anticipated that records will be
  encoded within one or more container XML
  element(s) of some kind
• candidate container element names include ltdcgt,
  ltdublinCoregt, ltresourcegt, ltrecordgt and ltmetadatagt

32
Element Refinements

• element refinements should be treated in the same
  way as other properties
• the name of the XML element should be an XML
  qualified name (QName)ltdctermsavailablegt2002-0
  6lt/dctermsavailablegt
• do not use any of the followingltdcdate
  refinement"available"gt2002-06lt/dcdategtltdcdate
  type"available"gt2002-06lt/dcdategtltdcdategt
  ltdctermsavailablegt2002-06 lt/dctermsavailablegt
  lt/dcdategt

33
Encoding schemes

• encoding schemes should be implemented using the
  'xsitype' attribute of the XML element for the
  property
• the name of the encoding scheme should be given
  as the attribute value, and should be in the form
  of an XML qualified name (QName)ltdcidentifier
  xsitype"dctermsURI"gt http//www.ukoln.ac.uk/
  lt/dcidentifiergt

34
OAI-PMH
35
OAI-PMH
http//www.openarchives.org/

• OAI Protocol for Metadata Harvesting
• simple protocol for sharing metadata records
  between applications
• currently at version 2.0
• based on HTTP, XML, XML Schema and XML namespaces
• allows a harvester to ask a remote repository for
  some or all of its metadata records
• where some is based on date-stamps, sets,
  metadata formats

36
OAI-PMH (2)

• OAI-PMH carries only metadata
• content (e.g. full-text or image) made available
  separately typically at URL in metadata
• simple DC is default (mandatory) record format
• supports any record format provided it can be
  encoded using XML (e.g. DC, IMS, MARC, ODRL, )

37
OAI-PMH model
resource
OAI-PMH identifier entry point to all records
pertaining to the resource
item
Dublin Core Metadata
records
MARC Metadata
Crystal Structure Report Jump-off page (HTML)
Model adapted from http//www.dlib.org/dlib/decem
ber04/vandesompel/12vandesompel.html
38
Data Flow in eBank UK
create
Institutional repository
Data files
Metadata
39
OAI-PMH model
ltdcidentifiergt
resource
OAI-PMH identifier entry point to all records
pertaining to the resource
item
records
Dublin Core Metadata
IMS Metadata
Crystal Structure Report Jump-off page (HTML)
11 principle
40
OAI-PMH outline record
ltrecordgt ltheadergt ltidentifiergtoaiecrysta
ls.chem.soton.ac.uk27lt/identifiergt
ltdatestampgt2004-07-20lt/datestampgt
ltsetSpecgt7374617475733D707562lt/setSpecgt
lt/headergt ltmetadatagt ltebankebank_dc
xsischemaLocation"http//www.rdn.ac.uk/oai/ebank
_dc/ http//www.rdn.ac.uk/oai/ebank/20040611/ebank
_dc.xsd"gt ltdcidentifier
xsitype"dctermsURI"gt
http//ecrystals.chem.soton.ac.uk/archive/00000027
/ lt/dcidentifiergt
lt/metadatagt lt/recordgt
41
OAI-PMH outline record
ltrecordgt ltheadergtlt/headergt ltmetadatagt
ltebankebank_dc xsischemaLocation"http//www.rdn
.ac.uk/oai/ebank_dc/ http//www.rdn.ac.uk/oai/eban
k/20040611/ebank_dc.xsd"gt
ltdcidentifier xsitype"dctermsURI"gt
http//ecrystals.chem.soton.ac.uk/archive
/00000027/ lt/dcidentifiergt
ltebankebank_dc xsischemaLocation"http//www.rdn
.ac.uk/oai/ebank_dc/ http//www.rdn.ac.uk/oai/eban
k/20040611/ebank_dc.xsd"gt
ltdcidentifier xsitype"dctermsURI"gt
http//ecrystals.chem.soton.ac.uk/archive
/00000027/cif lt/dcidentifiergt
lt/metadatagt lt/recordgt
42
OAI-PMH outline record
ltrecordgt ltheadergtlt/headergt ltmetadatagt
lt! Need a wrapper here ? ltebankebank_dc
xsischemaLocation"http//www.rdn.ac.uk/oai/ebank
_dc/ http//www.rdn.ac.uk/oai/ebank/20040611/ebank
_dc.xsd"gt ltdcidentifier
xsitype"dctermsURI"gt
http//ecrystals.chem.soton.ac.uk/archive/00000027
/ lt/dcidentifiergt
ltebankebank_dc xsischemaLocation"http//www.rdn
.ac.uk/oai/ebank_dc/ http//www.rdn.ac.uk/oai/eban
k/20040611/ebank_dc.xsd"gt
ltdcidentifier xsitype"dctermsURI"gt
http//ecrystals.chem.soton.ac.uk/archive
/00000027/cif lt/dcidentifiergt lt!
insert end wrapper here ? lt/metadatagt lt/recordgt
43
Wrapper choices

• Invent our own
• Re-use a packaging standard
• Choice from MPEG_DIDL, METS, IMS
• METS preliminary use
• Free
• Innate support for DC
• Dig-lib currency
• Increasing interest in packaging formats in the
  OAI-PMH community

For Links seehttp//www.dlib.org/dlib/december04/
vandesompel/12vandesompel.html
44
Using packaging

• ltmetadatagt
• lt! Need a wrapper here ?
• ltMETSmets xsischemaLocation"http//www.loc.gov/
  METS/ http//www.loc.gov/standards/mets/mets.xsd"
  xmlnsxsi"http//www.w3.org/2001/XMLSchema-instan
  ce" xmlnsMETS"http//www.loc.gov/METS/"
  xmlns"http//www.loc.gov/METS/"gt
• ltdmdSec ID"oaiecrystals.chem.soton.ac.uk27"
  gt
• ltmdWrap MDTYPE"DC" MIMETYPE"text/xml"
  LABEL"eBank Metadata"gt ltxmlData gt
• ltebankebank_dc xsischemaLocation"http//w
  ww.rdn.ac.uk/oai/ebank_dc/ http//www.rdn.ac.uk/oa
  i/ebank/20040611/ebank_dc.xsd"gt
• ltdcidentifier xsitype"dctermsURI"gt
• http//ecrystals.chem.soton.ac
  .uk/archive/00000027/
• lt/dcidentifiergt
• ltebankebank_dc xsischemaLocation"http//w
  ww.rdn.ac.uk/oai/ebank_dc/ http//www.rdn.ac.uk/oa
  i/ebank/20040611/ebank_dc.xsd"gtlt/ebank_dcgt

45
OAI-PMH model
DC 11 principle
Linking lta href gt
resource
OAI-PMH identifier entry point to all records
pertaining to the resource
item
records
Dublin Core Metadata
METS Metadata
Crystal Structure Report Jump-off page (HTML)
Dublin Core Metadata (eBank_dc)
Dublin Core Metadata (eBank_dc)
ltdcidentifiergt
ltdctype xsitypeeBankDtaasetTypegtCIFDatasetlt/dc
typegt
ltdctypegtCrystal Structurelt/dctypegt
46
Anatomy of an eBank UK record
47
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gtlt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?iss
  n1600-5368volume59fpageo501detailsyeslt/dcte
  rmsisReferencedBygt ltdctermsavailable
  gt2004-05-23lt/dctermsavailablegt

48
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gt???????lt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?issn
  1600-5368volume59fpageo501detailsyeslt/dcter
  msisReferencedBygt ltdctermsavailable
  gt2004-05-23lt/dctermsavailablegt

49
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gtlt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?iss
  n1600-5368volume59fpageo501detailsyeslt/dcte
  rmsisReferencedBygt
• ltdctermsavailable gt2004-05-23lt/dctermsavail
  ablegt

Add general subject terms e.g. Chemistry, Crystall
ography
Are there existing ontologies that can be re-used
for general subject terms?
50
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gtlt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?iss
  n1600-5368volume59fpageo501detailsyeslt/dcte
  rmsisReferencedBygt
• ltdctermsavailable gt2004-05-23lt/dctermsavail
  ablegt

51
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gtlt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?issn
  1600-5368volume59fpageo501detailsyeslt/dcter
  msisReferencedBygt ltdctermsavailable
  gt2004-05-23lt/dctermsavailablegt

52
eBank_dc schema

• ltebankebank_dc xmlnsebankterms"http//purl.org/
  ebank/terms/" xmlnsdcterms"http//purl.org/dc/te
  rms/" xsischemaLocation"http//www.rdn.ac.uk/oai
  /ebank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611
  /ebank_dc.xsd" xmlnsxsi"http//www.w3.org/2001/X
  MLSchema-instance" xmlnsebank"http//www.rdn.ac.
  uk/oai/ebank_dc/" xmlnsdc"http//purl.org/dc/ele
  ments/1.1/"gt ltdcidentifier xsitype"dctermsURI"
  gthttp//ecrystals.chem.soton.ac.uk/archive/0000002
  7/lt/dcidentifiergt
• ltdctype gtCrystal Structurelt/dctypegt
• ltdccreator gtHursthouse, Michael
  B.lt/dccreatorgt
• ltdccreator gtColes, Simon J.lt/dccreatorgt
• ltdcpublisher gtlt/dcpublishergt
• ltdcsubject xsitype"ebanktermsEmpiricalFo
  rmula"gtC14H22O6lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsIUPAC"gt(5,2
  -Dimethyl-5 -oxo-octahydro-2, 2
  bifuranyl-5-yl)-hydroxy-acetic acid ethyl
  esterlt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCCDC"gtHUZDEL
  lt/dcsubjectgt
• ltdcsubject xsitype"ebanktermsCompoundClas
  s"gtOrganiclt/dcsubjectgt
• ltdctermsisReferencedBy xsitypedctermsURI
  gthttp//scripts.iucr.org/cgi-bin/getarticleid?issn
  1600-5368volume59fpageo501detailsyeslt/dcter
  msisReferencedBygt ltdctermsavailable
  gt2004-05-23lt/dctermsavailablegt

53
eBank_dc schema (cont.)

• ltdctermsreferences xsitype"dctermsURI"gthttp//
  ecrystals.chem.soton.ac.uk/archive/00000027/ciflt/
  dctermsreferencesgt
• ltdctermsreferences xsitype"dctermsURI"gthttp//
  ecrystals.chem.soton.ac.uk/archive/00000027/proclt
  /dctermsreferencesgt
• ltdctermsreferences xsitype"dctermsURI"gthttp//
  ecrystals.chem.soton.ac.uk/archive/00000027/rfnelt
  /dctermsreferencesgt
• ltdctermsreferences xsitype"dctermsURI"gthttp//
  ecrystals.chem.soton.ac.uk/archive/00000027/solnlt
  /dctermsreferencesgt
• lt/ebankebank_dcgt
• ltebankebank_dc xmlnsdcterms"http//purl.org/dc/
  terms/" xmlnsebankterms"http//purl.org/ebank/te
  rms/" xmlnsxsi"http//www.w3.org/2001/XMLSchema-
  instance" xmlnsebank"http//www.rdn.ac.uk/oai/eb
  ank_dc/" xmlnsdc"http//purl.org/dc/elements/1.1
  /" xsischemaLocation"http//www.rdn.ac.uk/oai/eb
  ank_dc/ http//www.rdn.ac.uk/oai/ebank/20040611/eb
  ank_dc.xsd"gt
• ltdctype xsitype"ebanktermsEbankDatasetType"
  gtCIFDatasetlt/dctypegt
• ltdcidentifier xsitype"dctermsURI"gthttp//ec
  rystals.chem.soton.ac.uk/archive/00000027/ciflt/dc
  identifiergt
• lt/ebankebank_dcgt

METS Metadata
Dublin Core Metadata (ebank_dc)
Dublin Core Metadata (ebank_dc)
Dublin Core Metadata (ebank_dc)
54
Suggestions

• It useful to design two sets of metadata
• A core set expressible within the OAI-PMH Dublin
  Core manifestation
• an extended set specific to value-adding agents.
  
• Use OAI-PMH friends facility
• Define OAI-PMH sets for crystallography data

55
Questions?