You can select one of the three predefined XML schemas and for each schema an valid or invalid instance document.A click on the 'Validate' button will validate the content of the XML instance editor against the schema from the XML schema viewer.The XML Schema Validation example shows how to use Qt XML Patterns to validate XML with a W3C XML Schema.The example application shows different XML schema definitions and for every definition two XML instance documents, one that is valid according to the schema and one that is not.The following table shows the rules for validation when the Validation Type property is set to DTD. Schema value is set, the Xml Validating Reader validates the document according to the XML Schemas, including inline schemas.The following table shows the rules for validation when the Validation Type property is set to Schema. XDR value is set, the Xml Validating Reader validates the document according to XDR schemas, including inline schemas.As you can modify the content of the instance editor, different instances can be tested and validation error messages analysed.The example's main() function creates the standard instance of QApplication.
This also enables correct handling of include files from within the Relax NG parser.
All you have to do is use a parser that has DTD validation enabled: option, which loads the DTD and weaves attribute default values into the document.
Again, no validation is performed unless explicitly requested.
lxml also provides support for ISO-Schematron, based on the pure-XSLT skeleton implementation of Schematron: There is also basic support for The parser in lxml can do on-the-fly validation of a document against a DTD or an XML schema.
The DTD is retrieved automatically based on the DOCTYPE of the parsed document.