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META Tag Dictionary

META tags have two possible attributes:
  • HTTP-EQUIV="name "  CONTENT="content">
  • <META NAME="name"  CONTENT="content">

META tags should be placed in the head of the HTML document, between the <HEAD> and </HEAD> tags (especially important in documents using FRAMES).

HTTP-EQUIV tags

META tags with an HTTP-EQUIV attribute are equivalent to HTTP headers. Typically, they control the action of browsers, and may be used to refine the information provided by the actual headers. Tags using this form should have an equivalent effect when specified as an HTTP header, and in some servers may be translated to actual HTTP headers automatically or by a pre-processing tool. HTTP headers are defined in RFC1945 (HTTP/1.0) and RFC2068 (HTTP/1.1). Note that RFC2068 states that multiple headers with the same name may be present only if the values may be concatenated. HTTP headers may be generated by CGI scripts, and in 

Apache and CERN httpd by
using  a side file containing metadata. Other servers may have other mechanisms to  generate headers. Note that certain server-generated headers may not be overridden (such as Date), and that others are only meaningful with a non-200 status code. Using an HTTP header is preferable to using META tags, since the header will be understood by cache agents and proxies in addition to browsers, and metadata (such as PICS data) may be associated with image files, sound files, etc.

However, new HTTP headers should not be created without checking for conflict with existing ones since it is possible to interfere with server and proxy operation.
 
Expires


Source:
HTTP/1.1 (RFC2068)
     
The date and time after which the document should be considered expired. Controls cacheing in HTTP/1.0. In Netscape Navigator, a request for a document whose expires time has passed will generate a new network request (possibly with If-Modified-Since). An illegal Expires date, e.g. "0", is interpreted as "now". Setting Expires to 0 may thus be used to force a modification check at each visit. Web robots may delete expired documents from a search engine, or schedule a revisit.

Dates must be given in RFC850 format, in GMT. E.g. (META tag):
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 2012 08:21:57 GMT"> or (HTTP header):


Expires: Wed, 26 Feb 1997 08:21:57 GMT In HTTP 1.0, an invalid value (such as "0") may be used to mean "immediately".

See also Cache for discussion  about cache control, page expiry, etc.

Pragma
 
Controls cacheing in HTTP/1.0. Value must be "no-cache". Issued by  browsers during a Reload request, and in a document prevents Netscape Navigator cacheing a page locally.
 
Content-Type


Source:
HTTP/1.0 (RFC1945)
 
The HTTP content type may be extended to give the character set. As an HTTP/1.0 header, this unfortunately breaks older browsers. As a META tag, it causes Netscape Navigator to load the appropriate charset before displaying the page. E.g.

<META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-2022-JP">


Source: HTML 4.0 draft



Specifies the default scripting language in a document. See



MIMETYPES for applicable values.




Source:


HTML 4.0
  draft




Specifies the default style sheet language for a document.
Content-Language


Source:


HTTP/1.0,RFC1766
May be used to declare the natural language of the document. May
  be used by robots to categorize by language. The corresponding
Accept-Language header (sent by a browser) causes a server to select an
  appropriate natural language document. E.g.
<META HTTP-EQUIV="Content-language" CONTENT="en-GB"> or
  (HTTP header)



Content-language: en-GB languages are specified as the pair
  (language-dialect); here, English-British



Refresh


Source:





Netscape



Specifies a delay in seconds before the browser automatically
  reloads the document. Optionally, specifies an alternative URL to load. E.g.
<META HTTP-EQUIV="Refresh"
  CONTENT="3;URL=http://www.some.org/some.html">
or (HTTP header)



Refresh: 3;URL=http://www.some.org/some.html In Netscape
  Navigator, has the same effect as clicking "Reload"; i.e. issues an HTTP GET
  with Pragma: no-cache (and If-Modified-Since header if a cached copy
  exists).



Window-target


Source:


Jahn Rentmeister
Specifies the named window of the current page; can be used to
  stop a page appearing in a frame with many (not all) browsers. E.g.
<META HTTP-EQUIV="Window-target" CONTENT="_top">
or
  (HTTP header)



Window-target: _top



Ext-cache


Source:





Netscape



Defines the name of an alternate cache to Netscape Navigator.
E.g.
<META  HTTP-EQUIV="Ext-cache"

CONTENT="name=/some/path/index.db; instructions=User  Instructions">

Set-Cookie


Source:





Netscape
  Navigator




Sets a "cookie" in Netscape Navigator. Values with an expiry
date  are considered "permanent" and will be saved to disk on exit. E.g.
<META  HTTP-EQUIV="Set-Cookie"

CONTENT="cookievalue=xxx;expires=Friday, 31-Dec-99  23:59:59 GMT;
path=/">

PICS-Label


Source:





PICS



Platform-Independant Content rating Scheme. Typically used to
  declare a document's rating in terms of adult content (sex, violence, etc.)
  although the scheme is very flexible and may be used for other purposes.
Cache-Control


Source:





HTTP/1.1



Specifies the action of cache agents. Possible values:

  • Public - may be cached in public shared caches
  • Private - may only be cached in private cache
  • no-cache - may not be cached
  • no-store - may be cached but not archived

Note that browser action is undefined using these headers as
META  tags.
Vary


Source:





HTTP/1.1



Specifies that alternates are available. E.g.
<META HTTP-EQUIV="Vary" CONTENT="Content-language"> or
  (HTTP header)



Vary: Content-language implies that if a header
Accept-Language is sent an alternate form may be selected.



Lotus
The Lotus publishing tool generates Bulletin-Date and Bulletin-Text  attributes. Bulletin-Text contains a
document description.
NAME attributes
META tags with a name attribute are used for other types
  which do not correspond to HTTP headers. Sometimes the distinction is blurred;
  some agents may interpret tags such as "keywords" declared as either "name" or
  as "http-equiv".

Robots


Source:





Spidering



Controls Web robots on a per-page basis. E.g.
<META NAME="ROBOTS" CONTENT="NOINDEX,FOLLOW"> Robots
may  traverse this page but not index it.

Description


Source:





Spidering,AltaVista
,Infoseek.


A short, plain language description of the document. Used by
  search engines to describe your document. Particularly important if your
  document has very little text, is a frameset, or has extensive scripts at the
  top. E.g.
<META NAME="description" CONTENT="Citrus fruit
  wholesaler.">

Keywords


Source:





AltaVista,Infoseek.


Keywords used by search engines to index your document in
addition  to words from the title and document body. Typically used for synonyms
and  alternates of title words. E.g.
<META NAME="keywords" CONTENT="oranges, lemons,
  limes">

Author


Source:


  Publishing tools,
e.g.


Netscape
  Gold




Typically the unqualified author's name.
Generator


Source:


  Publishing tools, e.g.


Netscape
  Gold
,
FrontPage, etc.


Typically the name and version number of a publishing tool used
to  create the page. Could be used by tool vendors to assess market penetration.
Formatter


Source:


  Publishing tools -


Microsoft
FrontPage




Classification


Source:





Netscape
  Gold




Undefined.
Copyright


Source:


  Publishing tools
Typically an unqualified copyright statement.
Rating


Source:






  mk-metas
,
Weburbia (safe for kids)



Simple content rating.
VW96.ObjectType


Source:






  mk-metas




Based on an early version of the


Dublin
Core

report, using a  defined schema of document types such as FAQ, HOWTO.




Defined by


Queen's
University of  Belfast
;
a restricted set including e.g.  "Contact Information", "Image".


Dublin Core
DC.TITLE, DC.CREATOR, DC.SUBJECT, DC.DESCRIPTION,
DC.PUBLISHER, DC.CONTRIBUTORS  DC.DATE, DC.TYPE, DC.FORMAT, DC.IDENTIFIER,
DC.SOURCE, DC.LANGUAGE, DC.RELATION,
DC.COVERAGE, DC.RIGHTS
Dublin Core Elements. See the


Reference
Description




HTML 4.0
The


HTML 4.0
  Draft

is now available.


HTdig
htdig-keywords, htdig-noindex



HTdig tags. See the HTdig
META page
.



HTdig notification
htdig-email, htdig-notification-date, htdig-email-subject - see



HTdig
  notification
.



searchBC
searchBC is a regional search engine which uses a number of
common  tags such as Keywords. revisit is used as a hint for scheduling
revisits.
Apple META tags
Author-Corporate, Author-Personal, Author-Personal,
Publisher-Email, Identifier-URL, Ident  ifier, Coverage, Bo okmark -
Kodak
EKBU, EKdocType, EKdocOwner, EKdocTech, EKreviewDate, EKArea -
as  used by


Eastman Kodak.



IBM
ABSTRACT, CC, ALIAS, OWNER - as used by


IBM.


Page-Enter, Page-Exit, Site-Enter, Site-Exit


Source:





Microsoft
DHTML




Defines special effects transition; e.g.
<meta
  http-equiv="Page-Enter"
content="revealTrans(Duration=3.0,Transition=2)">
  See e.g. Transitions Between Pages (Ruleweb)

SHOE
Instance-Delegate, Instance-Key - see the


SHOE
Project

at the  University of Maryland (Simple HTML Ontology Extensions)


Microsoft Word
Microsoft Word 97 supports a number of HTML META attributes in
the  HTML export option. Content-Type is used to set the charset,
Generator is set and various other tags may optionally be set.
SIC87
1987 US SIC (Standard Industry Codes), used in Vancouver
Webpages  Classifieds. See US SIC Codes
RDU
The


Metadata
Search  Engine

lists many tags, including the  following:



  • contributor
  • custodian
  • custodian_contact
  • custodian_contact_position
  • east_bounding_coordinate
  • north_bounding_coordinate
  • relation
  • reply-to
  • south_bounding_coordinate
  • west_bounding_coordinate

Other Organisations

  • DMV MetaData for Mathematical Papers
  • Maple Square (ex. Sympatico)

Agent Markup Language
See the


AML
pages
.




  • Agent markup Language Version




GILS



Government Information Locator Service - a US government
  initiative. See

  • Washington GILS metadata attribute set


  • GILS profile (version
      2)

IMS
See the


IMS
Project

homepage.



  • Dictionary




Fireball



The German search engine


Fireball. See the metadata
page

and meta-tag
generator
.
Supports  Author, Publisher, Keywords, Description plus page-topic, page-type.



Miscellaneous

  • Version
  • Template
  • Operator
  • Creation
  • Host
  • Document
  • Subject
  • Build
  • Distribution - global,local, iu
  • Resource-type -
    document  (for ALIWeb)
  • Location (geographic location; from
      Sympatico)

Deprecated:

  • Random Text (e.g., META NAME="Tom Jones")

Web Counts
Attributes in use counted by a Web robot here.
Also counted 3
  July 97.



IAFA Template
  Statistics

from the ROADS
project




Other Resources



  • Resource Description
      Framework

    (RDF) - a W3C specification

  • The

  • META
      Generator

    (CGI script)

  • REL, REV tags

  • Resource
      Description

    (Connolly)


  • Metadata
      Architecture

    (TimBL, Jan 97)


  • META
      reference

    by Galactus


  • HTML
      3.2



  • META Tagging for Search
      Engines

    at stars.com


  • draft-musella-html-metatag-01.txt,version
      2


  • HTML Writers Guild FAQ

  • Jaggery the  Rascal's
    notes.


  • metadata at ERIN

  • report
      from

    the May 96 Indexing
      Workshop


  • draft-daviel-metadata-reg.txt (not.)

  • Dublin Core
      Generator

    at UKOLN


  • Dublin Core  Metadata
    Template

    at Nordic Metadata Project

  • Linking Metadata (draft-daviel-metadata-link-00.txt)

  • ADAM Quick Guide to
      Metadata

Thesauri

  • GETTY Art & Architecture Thesaurus
  • GETTY Artist Names Thesaurus
  • TGN - GETTY Thesaurus of Geographic Names


  • TGM  I US Library
    of Congress Thesaurus for  Graphic Materials I: Subject Terms


  • TGM II US Library of  Congress
    Thesaurus for Graphic Materials II: Genre and Physical Characteristic  Terms

  • LIV US Library of Congress Legislative Indexing Vocabulary

  • GLIN US Library
    of  Congress Global Legal Information Network (GLIN) Thesaurus


  • ISSN
    (International Standard  Serials Number)


  • LCSH (paper/CDROM)


  • LCSH, (telnet)

Other METAdata

  • Metadata Resources at IFLA


  • Metadata standards
      directories

    by CESSE (Belgium)


  • Conferences in
      1997



  • Workshop on Metadata
      Registries

    (July 1997)


  • Metadata
    Search  Engine



  • MetaWeb - the Australian  metadata
    project at DSTC


  • The
    Metadata Repository  Service


  • Meta Content Framework uwing XML (Netscape)
  • MCF Specification
  • MCF Vocabulary

  • MCF File Spec.


  • NSDI MetaData


  • SHOE
      Project



  • ROADS
    Project



  • PICS-SE (AID)


  • WebDAV
      proposal



  • GILS (US Gov.t  Information
    Locator Service), see also v2
    differences

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