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If you re determined to get up to speed with this technology, time invested in becoming familiar with these important sources is time well spent DSLs have at least three important attributes: Readability: This is perhaps the most important, because a well-designed DSL provides the context and the platform for communication between the domain expert and the technology expert The clarity and ease of this communication is crucial in developing a system that provides real value to the user Write-ability: This means statements written in the Domain-Specific Language are easily written, in an intuitive way, by both the domain expert and the technology expert There is a minimum of, if any, arcane rules of syntax to learn and remember Simplicity (remember the lack of expressiveness I mentioned at the beginning ): This goes hand-in-hand with the first two attributes Readability and write-ability won t be attained without simplicity..

It s also possible to have the same event call multiple handlers. You can do this in two ways. You can individually bind the event to two different event handlers; alternatively,

you can use a multicast delegate where you specify a list of event handlers, and when the event is fired, all the listed handlers will be invoked successively. You ll use the first alternative in the following example.

Microsoft XML Parser (MSXML) 3, which ships with IE 6, provides some additional properties and methods that you can use with the DOM interfaces discussed previously. You ll see examples of some of these additions later, as well as how to create similar functionality in Mozilla. Let s start by looking at extensions to the Document and Node interfaces:

Follow these steps: 1. Insert the code in Listing 15-8 into the click event handler for the fourth button.

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MSXML includes the following additions to the Document interface: load() loadXML() readystate onreadystatechange()

Listing 15-8. Button4_Click()

In 3, you saw how to create a domain-specific language (DSL) for a very simple domain using Intellipad, the M-aware text editor. In this chapter, you ll look at Quadrant, a modeling tool that addresses a wide range of tasks, including creating, maintaining, and editing models and data in the Repository or in other SQL database tables, as well as writing and editing M code. Quadrant is a powerful tool in terms of its functionality, and it has an extensive feature set. I could begin with a walkthrough each of the features in its menu tree, but that may not be the most interesting or productive way of getting the first-time user up to speed. A tool with an extensive feature set can be a bit overwhelming for the new user, so this chapter will approach its subject at a somewhat higher level. The intent here is to give you an overview of Quadrant without immersing you in too many of the details. Appendix D shows the Quadrant menu tree, so feel free to refer to that any time you would like to see where a particular feature fits.

' Create connection conn = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() cmd.CommandText = _ "select top 1 " _ & " customerid, " _ & " companyname " _ & "from " _ & " customers " cmd.Connection = conn ' Add second StateChange handler AddHandler conn.StateChange, AddressOf ConnStateChange2 Try ' Clear list box ListBox1.Items.Clear() ' Open connection conn.Open()

load(url) The load() method loads XML content from the URL argument: oDocument.load("dvd.xml"); The loading happens asynchronously, which means that the method returns immediately and the parser loads the XML. As the content loads, it changes the value of the readystate property and raises the onreadystatechange event. The load() method is also part of the DOM Level 3 Save and Load module. Mozilla supports both this method and the async property from DOM Level 3. loadXML(xml) The loadXML()method loads XML string data into a Document object. When called, it loads asynchronously. The method is useful for using string manipulation to create XML in JavaScript. The following line loads some simple XML content into a DOM Document from a string: oDocument.loadXML('< xml version="1.0" ><library/>');

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