12/26/2004 Joan A. Smith/CS-791/ODU 1Metadata Encoding & Transmission StandardHome page:http://www.loc.gov/standards/mets/2/26/2004 Joan A. Smith/CS-791/ODU 2What is Metadata?- It is “data about data”- The focus of "aboutness" is to enhance the use of the source data ... - Metadata from this perspective is any information which supports the effective use of data, including information which can facilitate data management (e.g., data authentication, data sequence, data type, key field indicators), data access (e.g., range, report parameter) and data analysis (e.g., format for data mining, visualization)Quoted in http://www.scils.rutgers.edu/~sypark/asis.html22/26/2004 Joan A. Smith/CS-791/ODU 3Not again?!• Yet another metadata encoding scheme!• Extant schemas include:– MARC (original LOC scheme dating from early 80’s)– Dublin Core (original flavor and new qualified version)– BibTeX/TeX/LaTeX– XML and its children (RDF, XHTML and WSDL, for example)– NISOIMG, VRA Core, (NISO Technical Metadata for Digital Still Images), LC-AV (Library of Congress Audiovisual Metadata), etc. etc. etc.• Eventually meta-meta-metadata encoding Æ metan?• So why bother? 2/26/2004 Joan A. Smith/CS-791/ODU 4Role of Metadata:Traditional Library• Bibliographic Role (library catalogue)– Search/locate an item– List/organize collection of items– Aid in item selection from among numerous options32/26/2004 Joan A. Smith/CS-791/ODU 5Role of Metadata:Digital Library• Card catalogue replaced with more flexible electronic system • Information objects can be located in more than one place, but still serve to enumerate the collection • Digital format facilitates item selection processA richer, more flexible and adaptable use of the original card catalog concept, but fundamentally the sameThe key to digital library access is the metadata2/26/2004 Joan A. Smith/CS-791/ODU 6Goal of METSTo provide a flexible mechanism:– for encoding descriptive, administrative, and structural metadata for a digital library object– for expressing the complex links between these various forms of metadata– which offers a useful standard for the exchange of digital library objects between repositories– enable the association of a digital object with behaviors or services42/26/2004 Joan A. Smith/CS-791/ODU 77 Basic METS Components1. METS Header2. Descriptive Metadata3. Administrative Metadata4. File Section5. Structural Map 6. Structural Links7. Behavior2/26/2004 Joan A. Smith/CS-791/ODU 8METS Header Example<metsHdr CREATEDATE="2003-07-04T15:00:00" RECORDSTATUS="Complete"> <agent ROLE="CREATOR" TYPE="INDIVIDUAL"> <name>Jerome McDonough</name> </agent> <agent ROLE="ARCHIVIST" TYPE="INDIVIDUAL"> <name>Ann Butler</name> </agent> </metsHdr>52/26/2004 Joan A. Smith/CS-791/ODU 9Descriptive Metadata Examples<dmdSec ID="dmd001"> <mdRef LOCTYPE="URN" MIMETYPE="application/xml" MDTYPE="EAD" LABEL="BerolCollection Finding Aid">urn:x-nyu:fales1735</mdRef> </dmdSec><dmdSec ID="dmd002"> <mdWrap MIMETYPE="text/xml" MDTYPE="DC" LABEL="Dublin Core Metadata"> <xmlData> <dc:title>Alice's Adventures in Wonderland</dc:title> <dc:creator>Lewis Carroll</dc:creator> <dc:date>between 1872 and 1890</dc:date> <dc:publisher>McCloughlin Brothers</dc:publisher> <dc:type>text</dc:type> </xmlData> </mdWrap> </dmdSec><dmdSec ID="dmd003"> <mdWrap MIMETYPE="application/marc" MDTYPE="MARC" LABEL="OPAC Record"> <binData>MDI0ODdjam0gIDIyMDA1ODkgYSA0NU0wMDAxMDA...(etc.) </binData> </mdWrap> </dmdSec>2/26/2004 Joan A. Smith/CS-791/ODU 10Administrative MetadataExample<amdSec ID="AMD001"> <mdWrap MIMETYPE="text/xml" MDTYPE="NISOIMG" LABEL="NISO Img. Data"> <niso:MIMEtype>image/tiff</niso:MIMEtype> <niso:Compression>LZW</niso:Compression> <niso:PhotometricInterpretation>8</niso:PhotometricInterpretation> <niso:Orientation>1</niso:Orientation> <niso:ScanningAgency>NYU Press</niso:ScanningAgency> </mdWrap> </amdSec> A <file> element within a <fileGrp> might then identify this administrative metadata as pertaining to the file it identifies by using an ADMID attribute to point to this <amdSec> element: <file ID="FILE001" ADMID="AMD001"> <FLocat LOCTYPE="URL">http://dlib.nyu.edu/press/testimg.tif</FLocat> </file>62/26/2004 Joan A. Smith/CS-791/ODU 11File Section Example<fileSec> <fileGrp ID="VERS1"> <file ID="FILE001" MIMETYPE="application/xml" SIZE="257537" CREATED="2001-06-10"> <FLocat LOCTYPE="URL">http://dlib.nyu.edu/tamwag/beame.xml</FLocat> </file> </fileGrp><fileGrp ID="VERS2"> <file ID="FILE002" MIMETYPE="audio/wav" SIZE="64232836" CREATED="2001-05-17" GROUPID="AUDIO1"> <FLocat LOCTYPE="URL">http://dlib.nyu.edu/tamwag/beame.wav</FLocat> </file> </fileGrp><fileGrp ID="VERS3" VERSDATE="2001-05-18"> <file ID="FILE003" MIMETYPE="audio/mpeg" SIZE="8238866" CREATED="2001-05-18" GROUPID="AUDIO1"> <FLocat LOCTYPE="URL">http://dlib.nyu.edu/tamwag/beame.mp3</FLocat> </file> </fileGrp> </fileSec>2/26/2004 Joan A. Smith/CS-791/ODU 12Structural Map Example<structMap TYPE="logical"> <div ID="div1" LABEL="Oral History: Mayor Abraham Beame" TYPE="oral history"> <div ID="div1.1" LABEL="Interviewer Introduction" ORDER="1"> <fptr FILEID="FILE001"> <area FILEID="FILE001" BEGIN="INTVWBG" END="INTVWND" BETYPE="IDREF" /> </fptr> <fptr FILEID="FILE002"> <area FILEID="FILE002" BEGIN="00:00:00" END="00:01:47" BETYPE="TIME" /> </fptr> <fptr FILEID="FILE003"> <area FILEID="FILE003" BEGIN="00:00:00" END="00:01:47" BETYPE="TIME" /> </fptr> </div> <div ID="div1.2" LABEL="Family History" ORDER="2"> <fptr FILEID="FILE001"> <area FILEID="FILE001" BEGIN="FHBG" END="FHND" BETYPE="IDREF" /> </fptr> <fptr FILEID="FILE002"> <area FILEID="FILE002" BEGIN="00:01:48"END="00:06:17" BETYPE="TIME" /> </fptr> <fptr FILEID="FILE003"> <area FILEID="FILE003" BEGIN="00:01:48" END="00:06:17" BETYPE="TIME" /> </fptr> </div> <div ID="div1.3" LABEL="Introduction to Teachers' Union" ORDER="3"> <fptr FILEID="FILE001"> <area FILEID="FILE001" BEGIN="TUBG" END="TUND" BETYPE="IDREF" /> </fptr> <fptr FILEID="FILE002"> <area FILEID="FILE002" BEGIN="00:06:18" END="00:10:03" BETYPE="TIME" /> </fptr> <fptr FILEID="FILE003"> <area FILEID="FILE003" BEGIN="00:06:18" END="00:10:03" BETYPE="TIME" /> </fptr> </div> </div> </structMap>72/26/2004 Joan A. Smith/CS-791/ODU 13Structural Links Example<div ID="P1" TYPE="page" LABEL="Page 1"> <fptr FILEID="HTMLF1"/> <div ID="IMG1" TYPE="image" LABEL="Image Hyperlink to Page 2"> <fptr FILEID="JPGF1"/> </div> <div ID="P2"TYPE="page" LABEL="Page 2"> <fptr