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How can it quickly filter out the information that it needs and ignore the unrelated details The solution is the XML Namespaces standard The core idea behind this standard is that every XML markup language has its own namespace that uniquely identifies all related elements Technically, namespaces disambiguate elements by making it clear to which markup language they belong All XML namespaces use URIs (universal resource identifiers) Typically, these URIs look like a web-page URL For example, http://wwwmycompanycom/mystandard is a typical name for a namespace Though the namespace looks like it points to a valid location on the Web, this isn t required (and shouldn t be assumed) URIs are used for XML namespaces because they are more likely to be unique Usually, if you create a new XML language, you ll use a URI that points to a domain or website you control.

A full discussion of XML Schema is beyond the scope of this book. However, if you want to learn more, you can consider the excellent online tutorials at http://www.w3schools.com/schema or the standard itself at http://www.w3.org/XML/Schema.

CacheDependency monitoring begins as soon as the object is created. If the XML file changes before you have added the dependent item to the cache, the item will expire immediately once it s added. If that s not the behavior you want, use the overloaded constructor that accepts a DateTime object. This DateTime indicates when the dependency monitoring will begin.

That way, you can be sure that no one else is likely to use that URI However, the namespace doesn t need to be a URI any sequence of text is acceptable..

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Figure 11-5 shows a simple test page that is included with the online samples for this chapter. It sets up a dependency, modifies the file, and allows you to verify that the cache item has been dropped from the cache.

The .NET Framework allows you to manipulate XML data with a set of classes in the System.Xml namespace (and other namespaces that begin with System.Xml). These types fully support the XML DOM (Document Object Model) Level 2 Core, as defined by the W3C. It also adds classes and methods that make it easier to read and write XML documents; navigate through nodes, attributes, and elements; and query, transform, and manipulate XML data in various ways.

Namespace names must match exactly. If you change the capitalization in part of a namespace, add a trailing / character, or modify any other detail, the XML parser will interpret it as a different namespace.

Sometimes, you might want to combine dependencies to create an item that s dependent on more than one other resource. For example, you might want to create an item that s invalidated if any one of three files changes. Or, you might want to create an item that s invalidated if a file changes or another cached item is removed. Creating these rules is easy with the new AggregateCacheDependency class introduced in ASP.NET 2.0. The AggregateCacheDependency can wrap any number of CacheDependency objects. All you need to do is supply your CacheDependency objects in an array using the AggregateCacheDependency.Add() method. Here s an example that makes a cached item dependent on two files: CacheDependency dep1 = new CacheDependency( Server.MapPath("ProductList1.xml")); CacheDependency dep2 = new CacheDependency( Server.MapPath("ProductList2.xml")); // Create the aggregate. CacheDependency[] dependencies = new CacheDependency[]{dep1, dep2} AggregateCacheDependency aggregateDep = new AggregateCacheDependency(); aggregateDep.Add(dependencies); // Add the dependent cache item. Cache.Insert("ProductInfo", prodInfo, aggregateDep); This example isn t particularly practical, because you can already supply an array of files when you create a CacheDependency object to get the same effect. The real value of AggregateCacheDependency appears when you need to wrap different types of objects that derive from CacheDependency. Because the AggregateCacheDependency.Add() method supports any CacheDependency-derived object, you could create a single dependency that incorporates a file dependency, a SQL cache dependency, and even a custom cache dependency.

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