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Site maps list all pages available on a web site and are used to make sure all pages are found by a search engine. The XML sitemap module (http://drupal.org/project/xmlsitemap) automatically creates and updates a site map, including automatic submission to several major search engines, as shown in Figure A-5. The module has a number of submodules, including those to create custom links, menu links, internalization, user links, and more; navigate to the Modules page to see all available submodules. Navigate to Configuration XML sitemap to set up and configure the module. A large number of configuration options are available, and although most default settings will work, I recommend the Drupal handbook for additional information: http://drupal.org/handbook/modules/xmlsitemap.

Design patterns are loosely described as time-tested, established solutions to recurring design problems. Formal design patterns are highly structured and follow strict templates. The design patterns that are presented in this book do not follow this rigorous format, but they are in keeping with the spirit of design patterns because they factor in industry-accepted practices for approaching recurring design problems.

Google announced in April 2010 that it uses site download speed as a new signal in our search ranking algorithms (http://googlewebmastercentral.blogspot.com/2010/04/using-site-speed-in-web -search-ranking.html). The Boost module (http://drupal.org/project/boost) significantly decreases the amount of time it takes for your site to load by caching HTML pages and completely removing all database queries. The module works hand in hand with Drupal s JavaScript and CSS caching,

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The weather forecast data is supplied by a Web Service whose WSDL document is located at www.webservicex.net/WeatherForecast.asmx WSDL. The National Oceanic & Atmospheric Administration (NOAA) has launched its own more complete forecast Web service at weather.gov/forecasts/xml/. Each time the Ajax Dashboard is opened, the Web service is contacted for the default ZIP code s weather forecast. Once open, at regular intervals or when the ZIP code is changed, the Web service is again contacted for an updated forecast. Ajax dynamically updates the forecast during these updates, so the update is seamless and does not require a complete refresh of the page. The stock ticker window keeps track of your favorite stocks performances on the stock market. Use it to see how fast your investments are growing and thus how soon you can retire (or, sadly, how fast they re falling and how much longer you ll have to work). Enter the desired stock tickers in the text box, check the box to enable the autorefresh feature, and watch how the stock prices update throughout the day, without ever having to manually refresh the page. Like the weather forecast, the stock tracker uses Ajax and automatically updates itself at set

providing GZIP compression as well as a number of configuration options to improve download speed. See http://drupal.org/node/545908 to learn more about installing and configuring Boost.

This section provides the information that you need in order to build a message-oriented Web service. It is organized along the same six steps presented earlier and provides both conceptual information and implementation information.

intervals to ensure that the information is up-to-date. The stock tracker retrieves its data from a Web Service whose WSDL is located at www.swanandmokashi.com/HomePage/WebServices/ StockQuotes.asmx WSDL. The news window is a simple window that displays the current top news stories supplied by Yahoo!. Instead of using a Web service, Yahoo! provides the news as an RSS feed. RSS is a simple XML-based format for distributing newslike items. RSS is simpler to work with than Web services. Like the weather forecast and stock ticker windows, the news window automatically refreshes itself periodically to provide the latest headline news. Clicking an item in the news window opens the article in a separate browser window. The last window on the Ajax Dashboard is a Yahoo! search component. This component is similar to the Yahoo! search example from 4. The big difference is that in this application, the search results display in a drop-down list box under the text box, which is updated as the user is typing the search time. This is really a combination of the Yahoo! search and autocomplete examples from 4. Clicking an item in the drop-down list opens the resource in a new browser window. Together these four components make up the Ajax Dashboard example. The components are all good candidates for Ajax techniques because they represent data that can change rapidly, and the ability to seamlessly update the data in one window without needing to refresh the entire page is a big plus.

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