Changes

* {{Code|validate:dtd('doc.xml', 'doc.dtd')}} validates the document {{Code|doc.xml}} against the specified DTD file {{Code|doc.dtd}}.

* The following example validates an invalid document against a DTD, which is specified as string:

try {

let $doc := <invalid/>

|

* Pass on document and schema as nodes:

let $doc := <simple:root xmlns:simple='http://basex.org/simple'/>

let $schema :=

</syntaxhighlight>

* Validate all documents of a database against the specified schema, using the supplied feature:

for $city in db:get('cities')

return validate:xsd($city, 'city.xsd',

If you want to use Schematron for validating documents, install Vincent Lizzi’s excellent [https://github.com/Schematron/schematron-basex Schematron XQuery Module for BaseX]:

repo:install('https://github.com/Schematron/schematron-basex/raw/master/dist/schematron-basex-1.2.xar')

</syntaxhighlight>

The following query illustrates how documents are validated. It is directly taken from the GitHub project:

import module namespace schematron = "http://github.com/Schematron/schematron-basex";