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The Simple Ajax Code Kit (SACK) was developed as a thin wrapper around the XMLHttpRequest object. Its author, Gregory Wild-Smith, thought many of the other frameworks were too complex and attempted to perform tasks they shouldn t, so he created SACK to simplify Ajax development. SACK consists of a handful of methods that simplify calling the server. In fewer lines than it takes to actually create a proper instance of an XMLHttpRequest object, you can send data to the server and handle the response. SACK consists of a single JavaScript file that contains a surprisingly small amount of code. The software behind SACK is released under a modified X11 license (also known as the MIT license), and like most open-source projects, documentation is not overwhelming; still, you ll certainly find enough to get started. The real strength of SACK is its simplicity if all you re looking for is a basic wrapper, try SACK. You can find more information at twilightuniverse.com/projects/sack/.

The User Relationships module (http://drupal.org/project/user_relationships) allows user to create relationships between each other, such as friends, co-workers, neighbors, and more. There are a number of included modules; see the project page for details.

Summary

The User Points module (http://drupal.org/project/userpoints) allows users to gain points for doing things such as posting nodes, commenting, moderating modules, making purchases, and more. See http://drupal.org/project/userpoints_contrib for the full list of contributed modules.

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sarissa attacks Ajax by wrapping support for the XML APIs in a browser-independent manner. The framework makes creating and working with XMLHttpRequest objects a breeze (no need to do a browser check; it s handled for you). However, sarissa also offers support for working with the DOM. Like Google AJAXSLT, sarissa provides support for XSLT by emulating Mozilla s processor on Internet Explorer. sarissa consists of just a handful of classes, and it s released under the GPL. Browser support for sarissa is strongest in Mozilla/Firefox and Internet Explorer with some functions unavailable in Opera, Konqueror, and Safari. You can find more information at sarissa.sourceforge.net/doc/.

This chapter introduced the main concepts behind SOA, which refers to distributed applications based on Web services technology. We defined what Web services actually are, within the context of SOA, and reviewed the main aspects of SOA. We briefly introduced the WS-I Basic Profile, the WS- specifications, and WSE, all of which are covered in detail in the second half of this book starting with 5.

Views is a flexible query builder that can be used to format and display data in powerful ways. If you come from a background of hand-coding MySQL queries, you will absolutely love the point-and-click nature of building queries and the ability to override every step of the process. In this appendix, I show the flexibility of views by stepping through the process of creating a number of views I typically use when creating a site. My recommendation is to use this chapter as a starting point when creating views and then search Drupal.org for follow-up questions. Before reading this chapter, read the section on the Views module in 7. Please note that I will frequently add to and update this chapter, which is available for download on the Apress web site (www.apress.com).

XHConn is similar to SACK in that it acts as a simple wrapper around the XMLHttpRequest object. Instead of working directly with the XMLHttpRequest object, you instantiate an instance of XHConn, working with it in much the same way you would XHR. That said, it does eliminate the browser check and provides a simple way to determine whether the browser even supports XHR (which is particularly handy for sites that need to degrade gracefully). XHConn works in Safari, Internet Explorer, Mozilla, Firefox, and Opera. Like the majority of the Ajax frameworks, it is an open-source implementation, which is released under a Creative Commons License. XHConn is a single file that contains little code, but it does what it sets out to do: simplify Ajax. You can find more information at xkr.us/code/javascript/XHConn/.

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