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.
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.
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.
that will add those custom attributes, and will show you how to validate documents that use those new attributes.
This information is specified in this model: Note: Adding new attributes to existing elements is easy; adding new elements is somewhat more difficult and beyond the scope of this article.
Now that you’ve defined the custom attributes, how do you place them where a validator can find them?
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.