Quick demo of validating an XML document against a schema

validate.rb

require 'nokogiri'


# Public: Find the absolute path to a file
# 
# This method finds a file that is relative to the
# location of the script, expanding anything that 
# needs expanding (~, etc.)
#
# filename - the filename to find
# Returns the absolute path to the file
def absolute_path(filename)
  File.expand_path(
    File.join(
      File.dirname(__FILE__),
      filename
    )
  )
end


schema = Nokogiri::XML::Schema(File.read(absolute_path('schema.xsd')))
document = Nokogiri::XML::Document(File.read(absolute_path('document.xml')))

errors = schema.validate(document).map { |error| error.message }

unless errors.empty?
  puts "Document did not validate: #{errors.join(', ')}"
else
  puts "Document validated!"
end