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The W3C XML specification states that a program should stop processing an XML document if it finds an error.
Any compliant implementation must support the W3C XML Schema language, but other languages like RELAX NG or Schematron may be supported as well.
Document type definition (DTD) validation is implemented using the validity constraints defined in the World Wide Web Consortium (W3C) Extensible Markup Language (XML) 1.0 Recommendation.
All three provide identical APIs in lxml, represented by validator classes with the obvious names.
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.
To validate the XML in the DOM, you can validate the XML as it is loaded into the DOM by passing a schema-validating Xml Reader to the Load method of the Xml Document class, or validate a previously unvalidated XML document in the DOM using the Validate method of the Xml Document class.
The Xml Document class validates the XML data as it is loaded into the DOM when a validating Xml Reader is passed to the Load method of the Xml Document class. Create("contoso Books.xml", settings) ' The Xml Document validates the XML document contained ' in the Xml Reader as it is loaded into the DOM. 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.Apart from the built-in DTD support in parsers, lxml currently supports three schema languages: DTD, Relax NG and XML Schema.Again, no validation is performed unless explicitly requested.XML schema is supported in a similar way, but requires an explicit schema to be provided: As described above, the parser support for DTDs depends on internal or external subsets of the XML file.DTDs use a formal grammar to describe the structure and syntax of compliant XML documents; they specify content and values allowed for the XML document.Tags: Adult Dating, affair dating, sex dating