.NET/Java PDF, Tiff, Barcode SDK Library

Load and Save will provide Web developers with a common API to access and modify the DOM in a language- and platform-independent way. In other words, it won t matter if you re on Windows or Linux, and it won t matter if you re developing in VBScript or JavaScript. You will also be able to save a DOM tree as an XML document or take an XML document and load it into the DOM. The specification also provides support for XML 1.1, XML Schema 1.0, and SOAP 1.2. Once available, it is expected to be widely used by developers.

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Figure 1-23. RCX Light Sensor The sensor is built into a brick, and you can see its internal construction in Figure 1-24. It uses a phototransistor like the NXT Light Sensor and has similar infrared spectral sensitivity. The light sensitivity is also comparable to the NXT, but partly because of physical placement of the always-on LED and the phototransistor, the RCX Light Sensor has notoriously poor sensitivity to low light. It seldom has a light reading below 10.

new() = new File2("defaulttxt") new(path) = { path = path ; innerFile = new FileInfo(path) } end let myFile2 = new File2("whatever2txt") Note that the only thing you can do in the initialization block of a constructor is to initialize the fields of a class or call another constructor to do that for you If you want to do other things in a constructor, you must you use the keyword then after the block and follow it by the extra expressions you want in the constructor This separates the initialization of fields from other code to ensure that nothing can happen to the fields of a class before they are properly initialized.

If you want to access the fields in a class outside the initialization block, you must give a name to the instance you re creating by qualifying the constructor; you do this using the keyword as followed by the alias for the instance The next example shows a constructor with some code following the initialization block The alias, x, is defined for the instance This is later used to test whether the file associated with the FileInfo object bound to the field innerFile exists #light open SystemIO type File3 = class val path: string val innerFile: FileInfo new(path) as x = { path = path ; innerFile = new FileInfo(path) } then if not xinnerFileExists then let textFile = xinnerFileCreateText() textFileDispose() end let myFile3 = new File3("whatever.

The RCX Rotation Sensor resolves 16 locations per rotation or 22.5 degrees (see Figure 1-25). Internally, it detects the vanes on a rotating shaft with two opto-interrupters. An opto-interrupter is a phototransistor and an LED that are pointed at each other with a small gap in between. The RCX or NXT watches the states of the two interrupters to determine which direction the sensor is rotating, and increments or decrements a counter accordingly. Unfortunately, at low speed, the sensor has some problems with losing counts.

We keep talking about the DOM, and if you haven t done a lot of work on the client side, you might not know what the DOM is. The DOM is a W3C specification for a platform- and languageindependent way of accessing and modifying the content and structure of a document. In other words, it s a common way to represent and manipulate an HTML or XML document. It s important to note that the design of the DOM is based on specifications from the Object Management Group, which allows it to be used with any programming language. It was originally conceived as a way of making JavaScript portable across browsers, though it has expanded beyond that limited application. The DOM really is an object model in the object-oriented sense. The DOM defines the objects needed to represent and modify documents, the behavior and attributes of these objects, and the relationship between these objects. You can think of the DOM as a tree representation of the data and structure on a page, though of course it may not actually be implemented that way. Say you have a Web page that looks something like Listing 2-5. Listing 2-5. Simple Table <table> <tbody> <tr> <td>Foo</td> <td>Bar</td> </tr> </tbody> </table> You can picture the DOM of this simple table as something like Figure 2-6. The beauty of the DOM specification is that it gives you a standard way to interact with your documents. Without the DOM, the most interesting aspects of Ajax wouldn t be possible. Since the DOM allows you to not only traverse but also edit the content, you can make highly dynamic pages.