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62 Developing Sites and Pages

Search engine optimization

Indexing involves the automatic collection of information about your web pages

by search engines such as Google, Yahoo!, Live Search, and many more. By

"harvesting" this information at the search engine, search engine users can make

use of this indexed information to obtain quick and accurate site search results

which match the search criteria entered by the user.

By default, the contents of each published web page (especially heading text)

will be indexed. However, in an Internet world of billions of web pages all being

constantly indexed, web developers can optimize this indexing process to allow

a site's pages to appear higher in a user's search results.

Optimization of web pages for search engines is possible in several ways:

• Meta Tags: Tags store search engine descriptors (i.e., keywords and

a description) for the site and/or an individual page. These tags are

used to allow better matching between entered search engine text (like

you might enter into Google) and the keywords you've associated with

your site or page. Additionally, a robots meta tag also lets you

include/exclude the site or pages from being indexed; hyperlinks to

other pages can also be prevented from being explored (crawled by

"spiders)".

• Robots: Pages (or folders) can be excluded from search-engine

indexing by using a robots file. This works in an equivalent way to the

robots meta tag but uses a text file (robots.txt) to instruct robots or

spiders what not to index. The file simply lists excluded site

page/folder references.

• Sitemaps: The opposite of the "robots" concept; pages can be

included to aid and optimize intelligent crawling/indexing. site page

references are stored in a dedicated sitemap file (sitemap.xml).

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Serif WebPlus Essentials Guía de usuario Pagina 70