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[A] model (of anything) is basically a construction, as concrete or as abstract as we please, that captures certain aspects of the thing being modeled where by capturing certain aspects I mean that features or properties of the model mimic, in certain specific ways, features or properties of the thing being modeled Study of the model can thereby lead to improved understanding of the thing being modeled In particular, therefore, a model of data is a construction necessarily somewhat abstract, since data itself is already a fairly abstract concept that captures certain aspects of data What aspects Well, the aspects we re interested in are clearly those that are intrinsic, as opposed to those that are mere artifacts of some particular representation or implementation We want to study data in its pure form and not be distracted by irrelevancies.

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< 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/mx" minWidth="955" minHeight="600" applicationComplete="initApp()"> <fx:Script> <![CDATA[ import mx.messaging.messages.*; import mx.messaging.events.*; private function processUserFormInput

Figure 6-42. The Spot light object is directional and can be rotated to focus its beam. In real life, more than one light source often affects an object, so Blender lets you have as many lamps as you require. On the spacebar menu, select Add Lamp, and position the new lamp in the 3D scene. Then, you can decide whether to make this lamp directional, how bright it should be, and the color of the light it emits, using the RGB sliders in the Lamp panel.

To use the usual jargon, we re interested in the logical aspects of data, not the physical aspects It follows that a good model of data will be one that (like the relational model) is logical, not physical ie, one that captures only logical aspects, not physical aspects (Ideally it would capture all of those logical aspects, of course, but this goal I take to be unachievable) Moreover, it shouldn t include anything else! ie, there should be no properties or features that don t correspond to anything intrinsic In IMS, for example, the very same data item can be interpreted either as a character string or as a packed decimal number; but this oddity is merely an artifact of the IMS model (if I might be permitted to use such a term) it certainly isn t something that s intrinsic to data per se.

(uName:String, uRequest:String):void { /* Set first message parameter to */ /* identify the message sender: a user or an agent */ sendMessage("user",uName, uRequest); } private function processAgentFormInput (aName:String, aComments:String):void { sendMessage("agent",aName, aComments); } private function initApp():void { consumer.subscribe(); } private function messageHandler(event: MessageEvent):void { var paramArray:Array = (event.message.body).split(":"); if(paramArray[0] == "user") { userName = paramArray[1]; userRequest = paramArray[2]; }else if(paramArray[0] == "agent") { agentName = paramArray[1]; agentComments = paramArray[2]; } } private function sendMessage (param0:String,param1:String, param2:String):void { var message: AsyncMessage = new AsyncMessage(); message.body = param0 + ":" + param1 + ": " + param2; producer.send(message); } ]]> </fx:Script> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <mx:Producer id="producer" destination="CollaborationTopic"/> <mx:Consumer id="consumer" destination="CollaborationTopic" message="messageHandler(event)"/> </fx:Declarations> <mx:Form id="collaborativeForm1" defaultButton="{updateUserInput}"> <mx:FormItem label="User Name"> <mx:TextInput id="userName"/> </mx:FormItem> <mx:FormItem label="User Request"> <mx:TextInput id="userRequest"/> </mx:FormItem> <mx:FormItem> <mx:Button label="Update User Inputs" id="updateUserInput"

4 To be more specific, a good data model will include a set of objects (using the word here in its generic sense, not its object-oriented sense), together with a set of operators for operating on those objects The objects allow us to model the structure of data The operators allow us to model its behavior Taken together, therefore, the objects and operators effectively constitute an abstract machine and we can thus usefully distinguish the model from its implementation, which is the physical realization of that abstract machine on some underlying real machine In a nutshell: The model is what users have to know about; the implementation is what users don t have to know about Next, the objects and operators of the model serve as a basis for further investigations into the nature of data.

click="processUserFormInput (userName.text, userRequest.text);"/> </mx:FormItem> </mx:Form> <mx:Form id="collaborativeForm2" defaultButton="{updateAgentInput}"> <mx:FormItem label="Agent Name"> <mx:TextInput id="agentName"/> </mx:FormItem> <mx:FormItem label="Agent Comments"> <mx:TextInput id="agentComments"/> </mx:FormItem> <mx:FormItem> <mx:Button label="Update Agent Input" id="updateAgentInput" click="processAgentFormInput (agentName.text, agentComments.text);"/> </mx:FormItem> </mx:Form> </s:Application>

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