xsd.rb

    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