Schema namespace contains extension methods that make it easy to validate an XML tree against an XML Schema Definition Language (XSD) file. This example uses the following XSD schema: Sample XSD File: Customers and Orders.However, the senders of those queries may potentially be using a variety of tools to generate the queries, and these tools may introduce trivial differences into the XML.
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The programming interface of the Xml Validating Reader class does not explicitly provide for a single method good at validating the whole content of a document.
Errors in XML documents will stop your XML applications.
You can use the Xml Validating Reader class to validate entire XML documents as well as XML fragments.
The class works on top of an XML reader—typically an instance of the Xml Text Reader class.
Much of this post is based on the OASIS specification (C14N), which describes a variety of ways to normalize an XML tree, including through the use of PSVI. Deep Equals reports that equivalent XML trees are unequal.
In the following example, the two trees have exactly the same content.
Because the class works on top of an existing XML reader, many methods and properties are just mirrored.
The dependency of validating readers on an existing text reader is particularly evident if you look at the class constructors.
In certain scenarios, it is important to be able to compare two XML trees for equivalence.
For example, if you are writing a web service that serves results of queries, and you want to cache query results so that duplicate queries use previously cached results instead of always accessing the underlying database.
The following example validates that the XML document from Sample XML File: Customers and Orders (LINQ to XML) is valid per the schema from Sample XSD File: Customers and Orders. This example uses the following XML document: Sample XML File: Customers and Orders (LINQ to XML).