Html Site-Maps. Top sites

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A site map (or sitemap) is a graphical representation of the architecture of a web site. [1] It can be either a document in any form used as a planning tool for web design, or a web page that lists the pages on a web site, typically organized in hierarchical fashion. This helps visitors and search engine bots find pages on the site.
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While some developers argue that site index is a more appropriately used term to relay page function, web visitors are used to seeing each term and generally associate both as one and the same. However, a site index is often used to mean an A-Z index that provides access to particular content, while a site map provides a general top-down view of the overall site contents.
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Site maps can improve search engine optimization of a site by making sure that all the pages can be found. This is especially important if a site uses Macromedia Flash or JavaScript menus that do not include HTML links. Most search engines will only follow a finite number of links from a page, so if a site is very large, the site map may be required so that search engines and visitors can access all content on the site.
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Google introduced Google Sitemaps so web developers can publish lists of links from across their sites. The basic premise is that some sites have a large number of dynamic pages that are only available through the use of forms and user entries. The sitemap files can then be used to indicate to a web crawler how such pages can be found. Google, MSN, Yahoo and Ask now jointly support the Sitemaps protocol. Since MSN, Yahoo, Ask, and Google use the same protocol, having a sitemap lets the four biggest search engines have the updated page information. Sitemaps do not guarantee all links will be crawled, and being crawled does not guarantee indexing. However, a sitemap is still the best insurance for getting a search engine to learn about your entire site.
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The Sitemaps protocol allows a webmaster to inform search engines about URLs on a website that are available for crawling. A Sitemap is an XML file that lists the URLs for a site. It allows webmasters to include additional information about each URL: when it was last updated, how often it changes, and how important it is in relation to other URLs in the site. This allows search engines to crawl the site more intelligently. Sitemaps are a URL inclusion protocol, and complement robots.txt, a URL exclusion protocol.
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when users cannot access all areas of a website through a browseable interface. In these cases, a search engine can't find these pages. For example, a site with a large "archive" or "database" of resources that aren't well linked to each other (if at all), only accessible via a search form. where webmasters use rich Ajax or Flash, and search engines can't navigate through to get to the content.
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The webmaster can generate a sitemap containing all accessible URLs on the site and submit it to search engines. Since Google, MSN, Yahoo, and Ask use the same protocol now, having a sitemap would let the biggest search engines have the updated pages information. Sitemaps supplement and do not replace the existing crawl-based mechanisms that search engines already use to discover URLs. By submitting Sitemaps to a search engine a webmaster is only helping that engine's crawlers to do a better job of crawling their site(s). Using this protocol does not guarantee that your webpages will be included in search indexes nor does it influence the way that pages are ranked by a search engine.
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In some situations, you may want to produce different Sitemaps for different paths on your site � e.g., if security permissions in your organization compartmentalize write access to different directories. Sitemap files have a limit of 50,000 URLs and 10 MegaBytes per sitemap. Sitemaps can be compressed using gzip, reducing bandwidth consumption. Multiple sitemap files are supported, with a Sitemap index file serving as an entry point for a total of 1000 sitemaps. As with all XML files, any data values (including URLs) must use entity escape codes for the characters : ampersand(&), single quote ('), double quote ("), less than (<) and greater than (>).
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HTML, an initialism of Hypertext Markup Language, is the predominant markup language for web pages. It provides a means to describe the structure of text-based information in a document � by denoting certain text as headings, paragraphs, lists, and so on � and to supplement that text with interactive forms, embedded images, and other objects.
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HTML is written in the form of labels (known as tags), surrounded by angle brackets. HTML can also describe, to some degree, the appearance and semantics of a document, and can include embedded scripting language code which can affect the behavior of web browsers and other HTML processors.
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HTML is also often used to refer to content of the MIME type text/html or even more broadly as a generic term for HTML whether in its XML-descended form (such as XHTML 1.0 and later) or its form descended directly from SGML (such as HTML 4.01 and earlier).
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In 1980, physicist Tim Berners-Lee, who was an independent contractor at CERN, proposed and prototyped ENQUIRE, a hypertext system for CERN researchers to use to share documents. In 1989, Berners-Lee and CERN data systems engineer Robert Cailliau each submitted separate proposals for an Internet-based hypertext system providing similar functionality. The following year, they collaborated on a joint proposal, the WorldWideWeb (W3) project, [1] which was accepted by CERN.
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Berners-Lee considered HTML to be, at the time, an application of SGML, but it was not formally defined as such until the mid-1993 publication, by the IETF, of the first proposal for an HTML specification: Berners-Lee and Dan Connolly's "Hypertext Markup Language (HTML)" Internet-Draft, which included an SGML Document Type Definition to define the grammar.[5] The draft expired after six months, but was notable for its acknowledgment of the NCSA Mosaic browser's custom tag for embedding in-line images, reflecting the IETF's philosophy of basing standards on successful prototypes.[6] Similarly, Dave Raggett's competing Internet-Draft, "HTML+ (Hypertext Markup Format)", from late 1993, suggested standardizing already-implemented features like tables and fill-out forms.[7]
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After the HTML and HTML+ drafts expired in early 1994, the IETF created an HTML Working Group, which in 1995 completed "HTML 2.0", the first HTML specification intended to be treated as a standard against which future implementations should be based.[6] Published as Request for Comments 1866, HTML 2.0 included ideas from the HTML and HTML+ drafts.[8] There was no "HTML 1.0"; the 2.0 designation was intended to distinguish the new edition from previous drafts.[9]
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Further development under the auspices of the IETF was stalled by competing interests. Since 1996, the HTML specifications have been maintained, with input from commercial software vendors, by the World Wide Web Consortium (W3C).[7] However, in 2000, HTML also became an international standard (ISO/IEC 15445:2000). The last HTML specification published by the W3C is the HTML 4.01 Recommendation, published in late 1999. Its issues and errors were last acknowledged by errata published in 2001.
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HTML 3.2 was never submitted to the IETF, whose HTML Working Group closed in September 1996;[13] it was instead published as one of the W3C's first "Recommendations" in early 1997. Math support as proposed by HTML 3.0 finally came about years later with a different standard, MathML.
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