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Using the current file, this code will succeed, and you ll be able to access the current node through the XmlValidatingReader object in the same way that you can with the XmlTextReader. However, consider what happens if you make the minor modification shown here: <DVD ID="A" Category="Science Fiction"> Now when you try to validate the document, an XmlSchemaException (from the System.Xml.Schema namespace) will be thrown, alerting you to the invalid data type the letter A in an attribute that is designated for integer values. Instead of catching errors, you can react to the ValidationEventHandler event. If you react to this event, you ll be provided with information about the error, but no exception will be thrown. To connect an event handler to this event, create a new ValidationEventHandler delegate and assign it to the XmlValidatingReader.ValidationEventHandler event just before you start to read the XML file: // Connect to the method named MyValidateHandler. vr.ValidationEventHandler += new ValidationEventHandler(ValidateHandler); The event handler receives a ValidationEventArgs class, which contains the exception, a message, and a number representing the severity: private void ValidateHandler(Object sender, ValidationEventArgs e) { lblInfo.Text += "Error: " + e.Message + "<br />"; } To try the validation, you can use the XmlValidation.aspx page in the online samples. This page allows you to validate a valid DVD list as well as another version with incorrect data and an incorrect tag. Figure 12-7 shows the result of a failed validation attempt.

Another related standard is XSL (Extensible Stylesheet Language), which is an XML-based language for creating stylesheets. Stylesheets (also known as transforms) are special documents that can be used (with the help of an XSLT processor) to convert your XML documents into other documents. For example, you can use an XSLT stylesheet to transform one type of XML to a different XML structure. Or you could use a stylesheet to convert your data-only XML into another text-based document such as an HTML page, as you ll see with the next example.

Of course, XSL stylesheets shouldn t be confused with CSS (Cascading Style Sheets), a standard used to format HTML. 15 discusses CSS.

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Sometimes a form may also accept files, which are provided a bit differently than other types of input. Files can be accessed as the attribute of the incoming request object, which forms use by accepting this attribute as a second positional argument.

Before you can perform a transformation, you need to create an XSL stylesheet that defines how the conversion should be applied. XSL is a complex standard in fact, it can be considered a genuine language of its own with conditional logic, looping structures, and more.

A full discussion of XSLT is beyond the scope of this book. However, if you want to learn more, you can consider a book such as Jeni Tennison s Beginning XSLT (Apress, 2004), the excellent online tutorials at http://www.w3schools.com/xsl, or the standard itself at http://www.w3.org/Style/XSL.

To transform the DVD list into HTML, you ll use the simple stylesheet shown here: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="/"> <html> <body> <xsl:apply-templates select="//DVD" /> </body> </html> </xsl:template> <xsl:template match="DVD"> <hr/> <h3><u><xsl:value-of select="Title" /></u></h3> <b>Price: </b> <xsl:value-of select="Price" /><br/> <b>Director: </b> <xsl:value-of select="Director" /><br/> <xsl:apply-templates select="Starring" /> </xsl:template> <xsl:template match="Starring"> <b>Starring:</b><br /> <xsl:apply-templates select="Star" /> </xsl:template> <xsl:template match="*"> <li><xsl:value-of select="." /></li> </xsl:template> </xsl:stylesheet>

Regardless of which way it was instantiated, any instance of a form will have a attribute, which contains a dictionary of whatever data was passed into it. In the case of an unbound form, this will be an empty dictionary. Using on its own isn t safe, because there s no guarantee that the user-submitted data is appropriate to what the form needs, and it could in fact pose a security risk. This data must always be validated before being used.

Rarely used, until loops as long as the condition fails. It is the opposite of while: n=1 until [ $n -gt 10 ] do echo "$n" n=$(( $n + 1 )) done

Every XSL file has a root <stylesheet> element. The <stylesheet> element can contain one or more templates (the sample file has four). In this example, the first <template> element searches for the root element. When it finds it, it outputs the tags necessary to start an HTML page and then uses the <apply-templates> command to branch off and perform processing for any contained <DVD> elements, as follows: <xsl:template match="/"> <html> <body> <xsl:apply-templates select="//DVD" /> </body> </html> </xsl:template> Each time the <DVD> tag is matched, a horizontal line is added, and a heading is created. Information about the <Title>, <Price>, and <Director> tag is extracted and written to the page using the <value-of> command. Here s the full template: <xsl:template match="DVD"> <hr/> <h3><u><xsl:value-of select="Title" /></u></h3> <b>Price: </b> <xsl:value-of select="Price" /><br/> <b>Director: </b> <xsl:value-of select="Director" /><br/> <xsl:apply-templates select="Starring" /> </xsl:template>

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