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Unlike other browser-based approaches, Ajax won t modify the link displayed in the address bar, meaning you cannot easily bookmark a page or send a link to a friend For many applications this may be desirable, but if your site provides driving directions or something similar, you will need a solution to this problem It s important to not go overboard with Ajax Remember, JavaScript is running on your client s browser, and having thousands of lines of JavaScript can severely slow down your users experiences Poorly coded scripts can quickly spiral out of control, especially as volume increases Ajax allows you to perform operations asynchronously, which is both its greatest strength and one of its major weaknesses We ve trained users that our Web applications perform in a request/response paradigm, but with Ajax, we no longer have that limitation.

Sometimes there is content you do not want indexed in a search engine but yet the content is accessible to anonymous users and search engines. Other times, content is available on multiple pages, and you want to remove pages that may appear as duplicate content. For example, I frequently have content types I do not want to appear in search indexes. One such example is the FAQ module (http://drupal.org/project/faq). This module creates a content type allowing you to create a node with a question and a corresponding answer. Drupal displays this as a full-page node, while the FAQ module also displays all questions and answers on a single page. Some search engines may penalize you because it appears you have duplicate content appearing on multiple site page. To work around this, I configure the Pathauto module (discussed in 7) with a base URL that I tell search engines not to index. The robots.txt file must be updated to work around this. It tells search engines which directories (that is, paths) should be included in search indexes (see Figure A-3). To ensure paths from specific content types are not indexed, you will need to set the base of the path to [content-type-name] and then add Disallow: /content-type-name/ to robots.txt.

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{ Console.WriteLine(message.Fault.ToString()); } else { if (message.Context.Addressing.Action.Value.EndsWith( "RequestQuote#PlaceTrade")) { // Deserialize the message body into an AcknowledgeMessage object // Since we have screened the Action, we know // what class to look for AcknowledgeMessage a = (AcknowledgeMessage)message.GetBodyObject( typeof(AcknowledgeMessage)); if (a.AcceptedToQueue) { Console.WriteLine("Your trade will be processed at 4PM EST today."); } else { Console.WriteLine("Your trade can't be processed at this time."); } } } } } This concludes the discussion on the WSE 3.0 messaging framework, and the discussion of one approach for integrating MSMQ with Web services.

We might be modifying a part of the page, and if the users aren t expecting that, they may be confused So, you need to be careful to keep things obvious to your users don t try to be too clever Remember, when in doubt, test with representative users!.

Figure A-3. The robots.txt file is configured to tell search engines not to index pages of a specific content type.

Summary

A number of contributed modules are available to help increase your search engine rank. Some modules allow you to customize HTML output on both a global and a per-page basis, such as meta tags, page titles, and menu attributes. Other modules, such as Path Redirect and Global Redirect, help reduce the chance for duplicate content. Finally, the SEO Checklist module provides you with a list of SEO to-do items for you to check off.

So, if innerHTML isn t the answer, what are you actually doing on the client side If you ve looked at the W3C s Load and Save specification, you would see things such as ACTION_APPEND_AS_CHILD and ACTION_REPLACE. Taconite supports these actions and others, giving you complete flexibility with content placement. Following the ideals of the Load and Save specification should make the transition from Taconite to the W3C specification easier. Taconite currently supports the following actions, assuming that the actions are in reference to a specified context element:

The SEO Checklist module (http://drupal.org/project/seo_checklist) provides a checklist of SEO best practices to help you keep track of what needs to be done on your site. It checks to see all modules installed on your site and gives you a list of to-do items. It also provides you with a date stamp next to each item after it s marked as completed. This is a great module to keep track of all SEO-related tasks that need to be performed on a site, especially if multiple people are working on a site. Follow the conversation at http://drupal.org/node/610934 to learn when this module will be ported to Drupal 7.

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