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Async = True Using reader As Xml Reader = Xml Reader. The Validation Event Handler is used for notification. (Disabled by default.)- --Report events if a validation warning occurs. Value) End Select End While End Using End Function Xml Reader provides forward-only, read-only access to XML data in a document or stream. Xml Reader also provides data conformance checks and validation against a DTD or schema. This model: In this section: Creating an XML reader Validating XML data Data conformance Navigating through nodes Reading XML elements Reading XML attributes Reading XML content Converting to CLR types Asynchronous programming Security considerations Use the Create method to create an Xml Reader instance. NET Framework provides concrete implementations of the Xml Reader class, such as the Xml Text Reader, Xml Node Reader, and the Xml Validating Reader classes, we recommend that you use the specialized classes only in these scenarios: To specify the set of features you want to enable on the XML reader, pass an System. Use the Read State property to check whether the reader is in error state. For example, the reported node type may be different from the actual node type of the current node. The Read State property value indicates the current state of the XML reader. (See the W3C XML Schema Part 1: Structures and the W3C XML Schema Part 2: Datatypes recommendations.) Therefore, although all valid XML documents are well formed, not all well-formed XML documents are valid. The properties of the class reflect the value of the current node, which is where the reader is positioned. It's considered valid if it's well formed and also conforms to the constraints defined by its DTD or schema.
The following methods make it easy to navigate through nodes and parse data. Xml Reader doesn't support XML-Data Reduced (XDR) schema validation. You can validate the data against a DTD, an inline XSD Schema, or an XSD Schema stored in an Xml Schema Set object (a cache); these scenarios are described on the Create reference page.If the reader is processing text data, it always checks that XML names are valid, regardless of this setting.Note: The XML 1.0 recommendation requires document-level conformance when a DTD is present.