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META Tag Dictionary META tags have two possible attributes: 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
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: 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 1997 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 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. Source: 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:
Specifies the default scripting language in a document. See Source: Specifies the default style sheet language for a document. 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 Source: 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"> 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). 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"> Window-target: _top Source:
Defines the name of an alternate cache to Netscape Navigator. E.g. <META HTTP-EQUIV="Ext-cache" Source: 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" Source: 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. Source: Specifies the action of cache agents. Possible values: Note that browser action is undefined using these headers as META tags. Source:
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. The Lotus publishing tool generates Bulletin-Date and Bulletin-Text attributes. Bulletin-Text
contains a document description. 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". Source: 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. 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."> Source: 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"> Source: Publishing tools, e.g.
Typically the unqualified author's name. Source: Publishing tools, e.g. 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. Source: Publishing tools - Source: Undefined. Source: Publishing tools Typically an unqualified copyright statement. Simple content rating. Source: Based on an early version of the 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 The HTdig notification htdig-email, htdig-notification-date, htdig-email-subject - see 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 IBM ABSTRACT, CC, ALIAS, OWNER - as used by Page-Enter, Page-Exit, Site-Enter, Site-Exit Source: Defines special effects transition; e.g. <meta http-equiv="Page-Enter" SHOE Instance-Delegate, Instance-Key - see the 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 Other Organisations
Agent Markup Language GILS Government Information Locator Service - a US government initiative. See IMS Fireball The German search engine Miscellaneous Deprecated:
Web Counts Attributes in use counted by a Web robot here. Other Resources Thesauri Other METAdata | |||||||||||||
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