The reason is that XML software should be small, fast, and compatible.
HTML browsers are allowed to display HTML documents with errors (like missing end tags). A "well formed" XML document is not the same as a "valid" XML document. In addition, it must conform to a document type definition.
Lets take an example: The does not contain type attribute in articles tag so this is not valid xml document.
When you run the above in Internet Explorer then it prints output as below indicating the error reason and line of error.
As a result, typed XML data replaces previously untyped XML data. Load(reader) ' Make an invalid change to the first and last ' price elements in the XML document, and write ' the Xml Schema Info values assigned to the price ' element during load validation to the console.
To create an XML schema-validating Xml Reader, follow these steps. Dim manager As Xml Namespace Manager = New Xml Namespace Manager(document. Add Namespace("bk", " Dim price Node As Xml Node = document.
To consider an XML document valid it must be validated, or verified, against a DTD. syntactically correct, then it doesn't mean it is valid also.In the code example that follows, a schema-validating Xml Reader validates the XML data loaded into the DOM. Schema Class Xml Document Validation Example Shared Sub Main() Try ' Create a schema validating Xml Reader. Validation Event Handler, New Validation Event Handler(Address Of Validation Event Handler) settings. Select Single Node("/bk:bookstore/bk:book/bk:price", manager) Console. Invalid modifications are made to the XML document and the document is then revalidated, causing schema validation errors. Dim settings As Xml Reader Settings = New Xml Reader Settings() settings. Finally, one of the errors is corrected, and then part of the XML document is partially validated. The last book ' element is invalid, but not included in validation. Select Single Node("/bk:bookstore/bk:book", manager) document. Validate(Address Of Validation Event Handler, book Node) Catch ex As Xml Exception Console.