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We already delved into REST a fair bit in the earlier sections on HTTPService and URLLoader. Let s walk through a complete simple example to reinforce what you ve learned so far. The example application uses the Yahoo! News Search REST API to fetch news items and then display them on a Flex-built interface. To get started, register with the Yahoo! Developer Network and get an application ID. The application ID is a mandatory part of every request you make to the Yahoo! API. It s easy to get one; just go to http://developer.yahoo.com/wsregapp/index.php. Yahoo! News Search involves simple HTTP REST calls that you can hand-code fairly easily in ActionScript and consume in your Flex application. Essentially, you create a query with all the required parameters and the headers, using URLRequest, URLRequestHeader, and URLVariables to do this. You then pass the URLRequest instance (which contains all the arguments for the REST call) to a URLLoader instance and send a request to the service. When the result returns, you consume it and bind it to a view component. That s exactly what we intended to do here, but then we stumbled upon the excellent client libraries implemented by Yahoo! to do this. Yahoo! has client libraries for the Search API in almost all major languages, including AS3. They package and distribute the AS3 client libraries as a part of the ASTRA Web APIs, which you can download from http://developer.yahoo.com/flash/astra-webapis/. These client libraries will save you from reinventing the wheel. If you plan to write a Flex/ActionScript client component for REST web service calls, use this implementation as a guide.

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Figure 5-12. Firefox prompts you to open .deb packages with gdebi by default. When gdebi is up and running, click the Install Package button in the upper-right corner to proceed. Repeat the process for the other Synfig packages you download. For those packages with additional dependencies that can be satisfied by the official Ubuntu repositories, gdebi takes care of the downloading and installation automatically (see Figure 5-13). This saves you a lot of boring searches and manual installations of standard packages.

indeed repeatedly reread, over 30 years after they were written! How many technical papers can you say that of ) Incidentally, it s not as widely known as it should be that Ted not only invented the relational model in particular, he invented the whole concept of a data model in general See his paper: Data Models in Database Management, ACM SIGMOD Record 11, No 2 (February 1981) This was the first of Ted s papers to include a definition of the term data model It also addressed the question: What purposes are data models in general, and the relational model in particular, intended to serve And it then went on to offer evidence in support of the claim that, contrary to popular belief, the relational model was the first data model to be defined.

< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" xmlns:yahoo="com.yahoo.webapis.search.*" minWidth="1024" minHeight="768"> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <!-- The formatter to format the total results with commas --> <mx:NumberFormatter id="commaFormatter"/> <!-- The Service for all types of searches --> <yahoo:SearchService id="searchService" applicationId="YahooDemo" query="{criteriaTextInput.text}" type="web" maximumResults="50"/> </fx:Declarations> <s:SkinnableContainer> <s:layout> <s:VerticalLayout horizontalAlign="center" paddingLeft="40" paddingTop="40" /> </s:layout>

(The socalled hierarchic and network models, which are often thought to have predated the relational model, were actually defined after the fact by a process of induction in this context, a polite word for guesswork from existing implementations) In connection with both the relational model in particular and data models in general, the paper also stressed the importance of the distinction, regrettably underappreciated even today, between a data model and its physical implementation Ted also saw the potential of using predicate logic as a foundation for a database language He discussed this possibility briefly in his 1969 and 1970 papers, and then, using the predicate logic idea as a basis, went on to describe in detail what was probably the very first relational language to be defined, Data Sublanguage ALPHA, in: A Data Base Sublanguage Founded on the Relational Calculus, Proc.

<s:TextInput id="criteriaTextInput"/> <s:Button id="searchButton" label="search" click="searchService.send()"/>

Figure 5-13. Gdebi downloads any additional packages required if they re available in the official Ubuntu repository.