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.
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.
It's an XSLT stylesheet; you run it on the DTD, and this produces a second stylesheet, which is a validator for the DTD.
The piece of XML to validate is specified in the constructor.
The W3C XML specification states that a program should stop processing an XML document if it finds an error.
The reason is that XML software should be small, fast, and compatible.