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To specify that an element belongs to a specific namespace, you simply need to add the xmlns attribute to the start tag and indicate the namespace. For example, the element shown here is part of the http://mycompany/OrderML namespace. If you don t take this step, the element will not be part of any namespace. <order xmlns="http://mycompany/OrderML"></order> It would be cumbersome if you needed to type in the full namespace URI every time you wrote an element in an XML document. Fortunately, when you assign a namespace in this fashion, it becomes the default namespace for all child elements. For example, in the XML document shown here, the <order> and <orderItem> elements are both placed in the http://mycompany/OrderML namespace: < xml version="1.0" > <order xmlns="http://mycompany/OrderML"> <orderItem>...</orderItem> <orderItem>...</orderItem> </order>

Figure 12-11. Using XPath to filter out results You can create a simple record browser using the XmlDataSource.XPath property. Just let the user choose an ID from another control (such as a drop-down list), and then set the XPath property accordingly: sourceDVD.XPath = "/DVDList/DVD[@ID=" + dropDownList1.SelectedValue + "]"; This works because data binding isn t performed until the end of the page life cycle.

GetXml() WriteXml()

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You can declare a new namespace for separate portions of the document. The easiest way to deal with this is to use namespace prefixes. Namespace prefixes are short character sequences that you can insert in front of a tag name to indicate its namespace. You define the prefix in the xmlns attribute by inserting a colon (:) followed by the characters you want to use for the prefix. Here s an order document that uses namespace prefixes to map different elements into two different namespaces: < xml version="1.0" > <ord:order xmlns:ord="http://mycompany/OrderML" xmlns:cli="http://mycompany/ClientML"> <cli:client> <cli:firstName>...</cli:firstName> <cli:lastName>...</cli:lastName> </cli:client> <ord:orderItem>...</ord:orderItem> <ord:orderItem>...</ord:orderItem> </ord:order> Namespace prefixes are simply used to map an element to a namespace. The actual prefix you use isn t important as long as it remains consistent.

Another option is to show nested elements by nesting one grid control inside another. This allows you to deal with much more complex XML structures. The remarkable part is that ASP.NET provides support for this approach without requiring you to write any code. This is notable, especially because it does require code to create the nested master-details grid display demonstrated in 10. The next example uses nested grids to create a list of movies, with a separate list of starring actors in each movie. To accomplish this, you begin by defining the outer grid. Using a template, you can display the title and director information: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="sourceDVD"> <Columns> <asp:TemplateField HeaderText="DVD"> <ItemTemplate> <b><% #XPath("./Title") %></b><br /> <%# XPath("./Director") %><br /> <br /><i>Starring...</i><br /> ... Now, you need to define another GridView control inside the template of the first GridView. The trick is in the DataSource property, which you can set using a new XPathSelect() data binding statement, as shown here: ... <asp:GridView id="GridView2" AutoGenerateColumns="False" DataSource='<%# XPathSelect("./Starring/Star") %>' runat="server"> ... When you call XPathSelect(), you supply the XPath expression that retrieves the XmlNodeList based on a search starting at the current node. In this case, you need to drill down from the root <DvdList> element to the group of <Star> elements. Once you ve set the right data source, all you need to do is define a template in the second GridView that displays the appropriate information. In this case, you need only a single data binding expression to get the element text: ... <Columns> <asp:TemplateField> <ItemTemplate> <%# XPath(".") %><br /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView>

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