Metadata

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Metadata is said to be data about data. In lay-terms it is a description about something.


Use on the Web

HTML META tag

[1]

Dublin Core

The following is a table of common DublinCore metadata expressed in META tags:

META tag value Implemented By
name="Abstract" Fireball.de
name="AC.activity" A-Core
name="AC.contact"
name="AC.date"
name="AC.email"
name="AC.name"
name="Adocom" Fireball.de
name="Aesop" Aesop.com
name="Agent markup Language Version" Agent Markup Language
name="Alkaline" AlkalineBot
name="Audience" Fireball.de
name="Author"

Fireball.de, Gigablast.com, html-to-rfc.pl, NetInsert.com

name="Autor" Fireball.de
name="Beschreibung" Fireball.de
name="blogchalk" Blogchalking.com
name="Bulletin-Date" Smart Bookmarks
name="Bulletin-Image"
name="Bulletin-Text"
name="ChristCrawler" ChristCENTRAL.com
name="CHTML" imode search engines
name="class" SiftGroups
name="Classification" Gigablast.com,

Netscape Compass Server,

Website Complete
name="Cleartype" Microsoft Pocket Internet Explorer
http-equiv="Content-Script-Type" N/A (?)
http-equiv="Content-Style-Type" N/A (?)
http-equiv="Content-Type" various browsers
name="Contributor" Fireball.de
name="Copyright" N/A
name="country" Gigablast.com
name="CreatedAppVer" WebSite Complete
name="Date"

htdig, html-to-rfc.pl, Inktomi Enterprise Search, SiftGroups, Suntek

name="DC.contributor" Dublin Core Metadata Initiative
name="DC.coverage"
name="DC.creator"
name="DC.date"
name="DC.description"
name="DC.format"
name="DC.identifier"
name="DC.language"
name="DC.name"
name="DC.publisher"
name="DC.relation"
name="DC.rights"
name="DC.source"
name="DC.subject"
name="DC.title"
name="DC.type"
name="DCTERMS.abstract"
name="DCTERMS.accessRights"
name="DCTERMS.alternative"
name="DCTERMS.audience"
name="DCTERMS.available"
name="DCTERMS.bibliographicCitation"
name="DCTERMS.conformsTo"
name="DCTERMS.created"
name="DCTERMS.dateAccepted"
name="DCTERMS.dateCopyrighted"
name="DCTERMS.dateSubmitted"
name="DCTERMS.extent"
name="DCTERMS.modified"
name="DCTERMS.hasFormat"
name="DCTERMS.hasPart"
name="DCTERMS.hasVersion"
name="DCTERMS.isFormatOf"
name="DCTERMS.isPartOf"
name="DCTERMS.isReferenceBy"
name="DCTERMS.isReplacedBy"
name="DCTERMS.isRequiredBy"
name="DCTERMS.issued"
name="DCTERMS.isVersion"
name="DCTERMS.mediator"
name="DCTERMS.medium"
name="DCTERMS.replaces"
name="DCTERMS.spatial"
name="DCTERMS.tableOfContents"
name="DCTERMS.temporal"
name="DCTERMS.<b style="color: rgb(0, 0, 0); background: none repeat scroll 0% 0% rgb(102, 255, 255); valid</b>"
name="Description" various robots
name="dipsie.bot" Dipsie.com
name="Distribution" site-index.pl
name="Division" Alaska Dept. of Environmental Conservation
name="dmoz.id" Syndic8.com
name="Eigentmer" Fireball.de
name="e-mail" NetInsert.com
name="expire" NetInsert.com
http-equiv="Expires" various browsers
http-equiv="Ext-cache" Netscape Navigator
name="fdse-description" fdse
name="fdse-keywords"
http-equiv="fdse-refresh"
name="fdse-robots"
name="feedsteridentity" Feedster.com
name="Formatter" Microsoft FrontPage
name="Gegenstand" Fireball.de
name="GEM.Audience" GEM Project
name="GEM.Cataloging"
name="GEM.Duration"
name="GEM.EssentialResources"
name="GEM.Grade"
name="GEM.Pedagogy"
name="GEM.Quality"
name="GEM.Standards"
name="Generator" various authoring tools
name="geo.country" Syndic8.com
name="geo.location" Geotags.com
name="geo.name" Geotags.com
name="geo.placename" Syndic8.com
name="geo.position" Geotags.com,

GeoURL.org,

Syndic8.com
name="geo.region" Geotags.com
name="Googlebot" Google.com
name="GoogleRank" N/A
name="handheldfriendly" AvantGo
name="herausgeber" Fireball.de
name="htdig-email" htdig
name="htdig-email-subject"
name="htdig-keywords"
name="htdig-noindex"
name="htdig-notification-date"
name="HistoryListText" PalmOS
name="iafa-description" site-index.pl
name="iafa-keywords"
name="ICBM" GeoURL.org
name="imagetoolbar" Microsoft Internet Explorer
http-equiv="Keywords" MOMspider
name="Keywords" various robots
name="language" Gigablast.com
name="LocalIcon" PalmOS Web Clipping Application Builder
name="location" MapleSquare.com
name="Microsoft Border" Microsoft FrontPage (?)
name="Microsoft Theme" Microsoft FrontPage (?)
http-equiv="MSSmartTagsPreventParsing" Microsoft Internet Explorer
name="Mytopic" Geocities.com
name="news" NetInsert.com
name="netinsert" NetInsert.com
http-equiv="Owner" MOMspider
name="Owner" IBM
http-equiv="Page-Enter" Microsoft Internet Explorer
http-equiv="Page-Exit"
name="PalmComputingPlatform" PalmOS
name="PalmDoNotCache" PalmOS
name="PalmHREFStyle" PalmOS proxy servers
name="PalmLauncherName" PalmOS Web Clipping Application Builder
name="PalmLauncherRevision" PalmOS Web Clipping Application Builder
name="PalmLargeIconFilename" PalmOS Web Clipping Application Builder
name="PalmPostEncoding" PalmOS Web Clipping Application Builder
name="PalmPQAVersion" PalmOS Web Clipping Application Builder
name="PalmSmallIconFilename" PalmOS Web Clipping Application Builder
name="Palm" PalmOS
http-equiv="MSThemeCompatible" Microsoft Internet Explorer
name="ObjectType" Fireball.de
name="Object-Type" Fireball.de
name="Pagetopic" Fireball.de
name="Page-Topic" Fireball.de
name="Pagetype" Fireball.de
name="Page-Type" Fireball.de
http-equiv="PICS-Label" various browsers
http-equiv="Pragma" various browsers
http-equiv="ProgId" Microsoft Internet Explorer
name="Rating" Weburbia, SearchBC
http-equiv="Refresh" various browsers
http-equiv="Reply-To" MOMspider
name="Resourcetype" Fireball.de
name="Resource-Type" site-index.pl
name="revision" NetInsert.com
name="revisit" CandianContent.net,

NetInsert.com,

SearchBC
name="Revisit-After" N/A
name="Robots" various robots
name="rss:image" Blogfeed
name="rss:language"
name="rss:link
http-equiv="save" Microsoft Internet Explorer
name="Schisselwort" Fireball.de
name="Section" Alaska Dept. of Environmental Conservation
name="Security" IBM
http-equiv="Set-Cookie" Netscape Navigator
name="Seitenthema" Fireball.de
http-equiv="SHOE" Simple HTML Ontology Extensions
http-equiv="Site-Enter" Microsoft Internet Explorer
http-equiv="Site-Exit"
name="state" Gigablast.com
name="Source" IBM
name="Status" html-to-rfc.pl
name="subject" SiftGroups
name="Template" Microsoft FrontPage, Microsoft Word
name="tgn.id" Syndic8.com
name="tgn.name" Syndic8.com
name="ThemeName" WebSite Complete
name="Thema" Fireball.de
name="title" html-to-rfc.pl
name="Urheberrechte" Fireball.de
name="VW96.ObjectType" SearchBC
name="WMDI.AliasURL" Weblog Metadata Initiative
name="WMDI.BlogrollLinkName"
name="WMDI.BlogrollSection"
name="WMDI.BlogrollURL"
name="WMDI.Category"
name="WMDI.CategorySource"
name="WMDI.Comments"
name="WMDI.ContactInfo
name="WMDI.CMS"
name="WMDI.ExternalBlogrollProvider"
name="WMDI.ExternalBlogrollURL"
name="WMDI.InternalBlogroll"
name="WMDI.LastUpdateType"
name="WMDI.OldURL"
name="WMDI.Trackback"
name="WMDI.TrafficMetric"
name="WMDI.TrafficValue"
http-equiv="Window-Target" Netscape Navigator
name="Zielgruppe" Fireball.de
name="zipcode" Gigablast.com

[2]

Tagging Content

For example, the following video about Elephants [3] may have tags about art, painting and self-portraits, because in the video the elephants are actually painting self-portraits (believe it or not). So in this example, the fact that we tag the video with things other than information about the elephant itself (such as location, age, size, type, gender, keeper, organization) but with things like art, painting or even as detailed as the type of paints and canvas used, provides a perfect example of how one mechanism of creating metadata (namely, tagging in this case) lets us discover things that would not be possible without the use of metadata.

YouTube tags:

elephant  paint  brush  self  portrait  zoo  charity  smart  wildlife  nature  
flower  talent  trick  art  artist  animal  funny  pet


Audio

ID3 is another form of metadata, particularly used for tagging audio files.

Video


Image





Tools


Resources


Tutorials


External Links


References

  1. List of the most common/supported META tags: https://gist.github.com/lancejpollard/1978404
  2. META tag snob: http://74.6.238.254/search/srpcache?ei=UTF-8&p=meta+tag+snob&fr=moz35&u=http://cc.bingj.com/cache.aspx?q=meta+tag+snob&d=4889434172888612&mkt=en-US&setlang=en-US&w=691355b0,1ddf3f13&icp=1&.intl=us&sig=8bK6MmmksTY6VwP8TyiV8g--
  3. Elephant Paints Self-Portrait (from YouTube): http://youtube.com/watch?v=1mPltVHkxyw
  4. Supplying FFmpeg With Metadata: http://multimedia.cx/eggs/supplying-ffmpeg-with-metadata/
  5. How to - Read Image Metadata: http://msdn.microsoft.com/en-us/library/xddt0dz7.aspx
  6. Metadata for images: http://www.ukoln.ac.uk/metadata/filter/report/report.html
  7. Understand and manage your image metadata: http://www.organizepictures.com/2008/06/iptc-xmp-image-metadata

See Also

Tags | Microformats | Microdata | RDFa | LOD | Video Annotations | HTML | HTTP | Privacy