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You can then validate some Element Tree document against the schema.You'll get back True if the document is valid against the Relax NG schema, and False if not: Note that this error log is local to the Relax NG object.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.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.This means that the XML file itself must either contain a DTD or must reference a DTD to make this work.Many Java XML APIs provide mechanisms to validate XML documents, the JAXP API can be used for most of these XML APIs but subtle configuration differences exists.

Schematron automatically converts these parameters to stylesheet parameters so you need not worry to set string parameters using quotes or to use XSLT.strparam().Since version 2.0, lxml.etree features pre-ISO-Schematron support, using the class lxml.etree. See Understanding Techniques for WCAG Success Criteria for important information about the usage of these informative techniques and how they relate to the normative WCAG 2.0 success criteria.If you want to validate an XML document against a DTD that is not referenced by the document itself, you can use the keyword argument to parse from a file.This also enables correct handling of include files from within the Relax NG parser.statement) and are valid according to the HTML version specified by the document type declaration.The developer can use off-line or online validators (see Resources below) to check the validity of the HTML pages.The The usage of validation phases is a unique feature of ISO-Schematron and can be a very powerful tool e.g. for establishing validation stages or to provide different validators for different "validation audiences". It will only contain log entries that appeared during the validation.Similar to XSLT, there's also a less efficient but easier shortcut method to do one-shot Relax NG validation: lxml.etree also has XML Schema (XSD) support, using the class lxml.etree. The API is very similar to the Relax NG and DTD classes.


  1. An LR1 parser is a finite-state automaton, equipped with a stack, which uses a combination of its current state and one lookahead symbol in order to determine which action to perform next. We present a validator which, when applied to a context-free grammar G and an automaton A, checks that A and G agree.

  2. If you want the parser to succeed regardless of the outcome of the validation, you should use a non validating parser and run the validation separately after parsing the document.

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