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A good part of the success of the XML standard is due to its remarkable flexibility. Using XML, you can create exactly the markup language you need. This flexibility also raises a few problems. With developers around the world using your XML format, how do you ensure that everyone is following the rules The solution is to create a formal document that states the rules of your custom markup language, which is called a schema. These rules won t include syntactical details (such as the requirement to use angle brackets or properly nest tags) because these requirements are already part of the basic XML standard. Instead, the schema document will list the logical rules that pertain to your type of data. They include the following: Document vocabulary: This determines what element and attribute names are used in your XML documents. Document structure: This determines where tags can be placed and can include rules specifying that certain tags must be placed before, after, or inside others. You can also specify how many times an element can occur. Supported data types: This allows you to specify whether data is ordinary text or must be able to be interpreted as numeric data, date information, and so on. Allowed data ranges: This allows you to set constraints that restrict numbers to certain ranges or that allow only specific values. The XML Schema standard defines the rules you need to follow when creating a schema document. The following is an XML schema that defines the rules for the product catalog document shown earlier: < xml version="1.0" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="productCatalog"> <xsd:complexType> <xsd:sequence>

Even if the change doesn t go through the expected stored procedures, the change should still be noticed, and the notification should still be delivered to ASPNET Finally, the notification method needs to support web farms Microsoft put together a team of architects from the ASPNET, SQL Server, ADONET, and IIS groups to concoct a solution They came up with two different architectures, depending on the database server you re using Both of them use the same SqlCacheDependency class, which derives from the CacheDependency class you saw earlier..

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Using XPathNavigator: You can load the document into an XPathNavigator (which is located in the System.Xml.XPath namespace). Like the XmlDocument, the XPathNavigator holds the entire XML document in memory. However, it offers a slightly faster, more streamlined model than the XML DOM, along with enhanced searching features. Unlike the XmlDocument, it doesn t provide the ability to make changes and save them. Using XmlTextReader: You can read the document one node at a time using the XmlTextReader class. This is the least expensive approach in terms of server resources, but it forces you to examine the data sequentially from start to finish. The following sections demonstrate each of these approaches to loading the DVD list XML document.

<xsd:element name="catalogName" type="xsd:string"/> <xsd:element name="expiryDate" type="xsd:date"/> <xsd:element name="products"> <xsd:complexType> <xsd:sequence> <xsd:element name="product" type="product" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:complexType name="product"> <xsd:sequence> <xsd:element name="productName" type="xsd:string"/> <xsd:element name="productPrice" type="xsd:decimal"/> <xsd:element name="inStock" type="xsd:boolean"/> </xsd:sequence> <xsd:attribute name="id" type="xsd:integer"/> </xsd:complexType> </xsd:schema> Every schema document is an XML document that begins with a root <schema> element. Inside the <schema> element are two types of definitions the <element> element, which defines the structure the target document must follow, and one or more <complexType> elements, which define smaller data structures that are used to define the document structure. The <element> tag is really the heart of the schema, and it s the starting point for all validation. In this example, the <element> tag identifies that the product catalog must begin with a root element named <productCatalog>. Inside the <productCatalog> element is a sequence of three elements. The first, <catalogName>, contains ordinary text. The second, <expiryDate>, includes text that fits the rules for date representation, as set out in the schema standard. The final element, <products>, contains a list of <product> elements. Each <product> element is a complex type, and the type is defined with the <complexType> element at the end of the document. This <product> complex type consists of a sequence of three elements with product information. The elements must store this information as text (<productName>), a decimal value (<productPrice>), and a Boolean value (<inStock>), respectively.

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