Download PDF by Jeffrey D. Ullman: Principles of Database and Knowledge-Base Systems: The New

By Jeffrey D. Ullman

ISBN-10: 071678162X

ISBN-13: 9780716781622

Quantity 2 of "Principles of database and Knowledge-Base structures" covers question optimization in database platforms, and explains extensions of those principles to deal with the extra expressive question languages which are utilized in knowledge-base platforms. lately came across strategies for effective implementation of common sense languages is mentioned, besides the layout of a few experimental knowledge-base platforms. The "universal relation" version, for figuring out queries posed in usual language or in very high-level languages, can also be taken care of.

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Team LiB ] [ Team LiB ] 35 36 Text Component To obtain maximum search engine visibility, it is essential to understand how your target audience is searching for actual information on your web site. When your target audience uses a search engine to find the products and services you offer, they type a set of words or phrases into the search box. This set of words is commonly called your site's keywords or keyword phrases. For your target audience to find your site on the search engines, your pages must contain keyword phrases that match the phrases your target audience is typing into search queries.

It is not important for visibility in the major search engines. If you do not have the time to create unique content for this attribute, then you can safely skip this optimization procedure. • Misspelled keywords. Because some keywords (such as the word "millennium") are commonly misspelled, you might want to put a misspelled keyword in your meta-keywords tag. However, if that misspelled word does not appear in your main body text, this strategy is generally a waste of time. Search engines use both keyword frequency and keyword placement in their algorithms.

In other words, when a search engine spider encounters a word or phrase from its list of stop words, it leaves the site without saving any of the site information to its index. Sites already in the search engine index can be removed and banned from resubmission if the search engine finds stop words on your web pages. Some search engines define "stop words" and "filter words" identically. When preparing your keyword list, eliminate all filter words because they are ignored anyway. If you would like to determine whether a word is a filter word, perform a search on a search engine, such as Google.

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Principles of Database and Knowledge-Base Systems: The New Technologies by Jeffrey D. Ullman

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