The code below shows a method #validate which uses Nokogiri to validate an XML document against an XSD schema. It returns an array of Nokogiri::XML::SyntaxError Show archive.org snapshot objects.

require 'rubygems'
gem 'nokogiri'
require 'nokogiri'

def validate(document_path, schema_path, root_element)
  schema = Nokogiri::XML::Schema(File.read(schema_path))
  document = Nokogiri::XML(File.read(document_path))
  schema.validate(document.xpath("//#{root_element}").to_s)
end

validate('input.xml', 'schema.xdf', 'container').each do |error|
  puts error.message
end

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This note was contributed by Matthias Marschall from the Agile Web Development & Operations Show archive.org snapshot blog.