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The position coordinates follow the standard conventions of graphs in mathematics. The Y-axis points up, the X-axis points to the right, and the point where they cross is the origin. (This is a little different from the 2D coordinates in the lcdui.Graphics class, where the origin is the top-left corner and the Y coordinate increases as you go down.) Then to see where to find the Z-axis, think of yourself as being above the x-y plane looking down on it. Then if you look directly down at the origin, your eye is at some positive point along the Z-axis. So the standard orientation is that you are looking down the Z-axis toward the points with negative Z coordinates. Figure 9-2 shows what a square-base pyramid would look like from this angle. And, as in familiar mathematical notation, the coordinates of each point are given as a 3-tuple in x-y-z order.

The last step is to connect Fetch Feed to Pipe Output (see Figure 10-20), and run and publish the pipe. You can see the final Yahoo! Pipe results in Figure 10-21.

This retrieved XML content contains two books from a library. How the data is stored on the server side is the responsibility of the HTTP server. The data could be stored as an XML file or it could be dynamically generated. From the perspective of an external application, the data is based on XML. The description of the book is simple as there are three fields: ISBN, Title, and Author.

Now that you have connected to data sources to send and retrieve data, the next step is interconnectivity. This is the process of placing the data into a data model, preparing the data for display, and attaching the data into a user interface. When building a mashup, you retrieve information through a UI from the user. You then may need to validate the information, format it, create a data model, and send the request to a data source (see Figure 10-22).

Figure 10-22. Reading data, interconnectivity, and sending results to a UI Similarly, once you retrieve information from a data source, you may need to validate the information, format it, create a data model, and display the results back in a UI (see Figure 10-23).

Figure 9-2. Looking down the Z-axis at a square-base pyramid on the x-y plane This sample code fragment shows how to define the vertices of a square-base pyramid with its top point at the point (0, 0, 10): // Every set of three elements of this array // gives a vertex of the pyramid. The top row gives // all of the vertices needed, however we include some // extra copies of some of the vertices to try // different things with them: short[] vertices = { 0, 0, 10, 10, 0, 0, 0, 10, 0, 0, -10, 0, -10, 0, 0, 0, -10, 0, 10, 0, 0, 0, 0, 10 }; // Here we construct the VertexArray, which is // a generic data structure for storing collections

Figure 10-23. Getting information from the user, interconnectivity, and sending results to a data source Keep in mind that following all these steps is not always necessary, since there may be times when you don t need to validate or format the information.

The HTML content that contains the Ajax technology is implemented as a single HTML page. The HTML page does not include the XML content when the HTML page is downloaded. You could be cynical and say, but that is the point of Ajax for the XML content to be downloaded separately from the HTML page. This goes back to the example web page in Figure 2-1, where the XML file represents the brown area, and the downloaded page represents the blue areas. Following is the implementation of the Ajax application to download the XML books data: <html><head> <title>Sample Page</title> <script language="JavaScript" type="text/javascript"> var xmlhttp = null; xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); function GetIt( url) { if( xmlhttp) { EBVN xmlhttp.open('GET', url, false); xmlhttp.send(null); document.getElementById('result').innerHTML = xmlhttp.responseText; } } </script> </head> <body> <button onclick="GetIt('/cgross/books')">Get a document</button> <p><table border="1"> <tr><td>Document</td><td><span id="result">No Result</span></td></tr> </table></p> </body> </html> In the HTML content (the elements contained by the HTML body tags), a button is defined that when clicked will call the function GetIt. The parameter for the function GetIt is the URL for the resource that contains the XML book data. The data, when retrieved and processed, is presented in an HTML table, where one column (indicated by the td HTML tag) contains a span HTML tag. The span tag uses the attribute id to define a place where the retrieved data is displayed. The attribute id is a unique identifier that can be used by JavaScript to reference an HTML element.