Validating xml against schema

30-Jul-2016 09:56 by 7 Comments

Validating xml against schema

Load(reader) Dim navigator As XPath Navigator = document. Create("contoso Books.xml", settings) Dim document As Xml Document = New Xml Document() document.

The purpose of the schema is to define the legal building blocks of an XML document. For more information about modifying values using the Set Typed Value method, see the Modify XML Data using XPath Navigator topic. Modifications made using the Set Typed Value method of the XPath Navigator class resulted in an Invalid Cast Exception because the new value was invalid according to the schema type of the node.Using the Xml Document class, you can validate the XML content contained in an Xml Document object in two ways. If a Validation Event Handler is set on the validating Xml Reader, the Validation Event Handler will get called whenever an invalid type is encountered. Message) Exit Sub End Select End Sub End Class After modifications are made to an XML document, you can validate the modifications against the schema for the XML document using the Validate method of the Xml Document class. XPath Class Validating Reader Example Shared Sub Main(By Val args() As String) Try Dim settings As Xml Reader Settings = New Xml Reader Settings() settings. The first way is to validate the XML content using a validating Xml Reader object and the second way is to use the Validate method of the Xml Document class. An Xml Schema Exception will be thrown when an attribute or element with Typed Value set to is accessed by the XPath Navigator. The following example validates the file as it is loaded into the Xml Document object by creating the Xml Document object using a validating Xml Reader object. A validating Xml Reader object is created by passing an Xml Reader Settings object to the Create method of the Xml Reader class that takes an Xml Reader Settings object as a parameter. XPath Class Validating Reader Example Shared Sub Main(By Val args() As String) Try Dim settings As Xml Reader Settings = New Xml Reader Settings() settings.

The Xml Reader Settings object passed as a parameter has a Validation Type property set to and an XML Schema for the XML document contained in the Xml Document object added to its Schemas property.

Message) Exit Sub End Select End Sub End Class In the example above, two modifications are made to the XML document contained in the Xml Document object.

XML document that also conforms to the rules of a schema that defines the legal elements of an XML document.

Both the XPath Document class and the Xml Document class create XPath Navigator objects to navigate and edit XML documents.

Message) End Try End Sub Shared Sub Schema Validation Handler(By Val sender As Object, By Val e As Validation Event Args) Select Case e. The XPath Document class is a read-only, in-memory representation of an XML document.

In this example, the validation errors were introduced after the XML document was loaded and were found using the Validate method of the Xml Document class.

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