Validating the xml

If the values match the assertion passes, otherwise it fails.Let's jump right in, here is a login response message that we want to validate; Basically we want to check for the login Response and sessionid elements in the SOAP Body, but ignore the actual value of the sessionid since it will change between each request.XML data is valid when the elements and the content of the individual elements in the XML data conform to the declared data types specified in the schema or DTD. NET is handled primarily by the classes present in a handful of namespaces: System. The classes that are commonly employed to validate the XML document are Xml Reader, Xml Reader Settings, Xml Schema Set, and Xml Node Reader.

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Usually when HTML is parsed the document is saved with the HTML serializer, but with this option the resulting document is saved with the XML serializer.This is primarily used to generate XHTML from HTML input.I'll also walk you through some of the different scenarios and ways in which you can validate an XML document with an XSD schema programmatically (see Table 1). NET Framework 2.0 means you can perform XML data validation against a Document Type Definition (DTD) or an XML schema. XSD schema-based validation is the industry-accepted standard and will be the method of XML validation in this article.You specify the validation settings as well as a Validation Event Handler method using the Xml Reader Settings object. I won't explain how to validate XML data using DTDs because those are not typically used outside legacy applications.Now that the program is ready to validate with an XML Schema definition, it is necessary only to ensure that the XML document is associated with (at least) one.

There are two ways to do that: , which stands for "XML Schema instance." The second line specifies the schema to use for elements in the document that do not have a namespace prefix-that is, for the elements you typically define in any simple, uncomplicated XML document.

You also set a factory attribute to specify the parser language to use.

(For SAX parsing, on the other hand, you set a property on the parser generated by the factory).

When a base parameter is used in conjunction with the load_ext_dtd method the base parameter is ignored and the current directory is used as the base parameter.

In other words, when validating XML with Lib XML any base parameter option will be ignored, which may result in unexpected DTD loading errors.

When a call to validate fails to parse the document, the error may be retrieved using last_error.