Expose difference in behaviour in MRI vs JRuby

example.rb

require 'nokogiri'
puts "Ruby: #{RUBY_DESCRIPTION}"
puts "Nokogiri: #{Nokogiri::VersionInfo.instance.to_hash['nokogiri']}"
puts

schema = <<-SCHEMA
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>

 <xs:element name="addresses">
  <xs:complexType>
   <xs:sequence>
     <xs:element ref="address" minOccurs='1' maxOccurs='unbounded'/>
   </xs:sequence>
 </xs:complexType>
</xs:element>

 <xs:element name="address">
  <xs:complexType>
   <xs:sequence>
     <xs:element ref="name" minOccurs='0' maxOccurs='1'/>
     <xs:element ref="street" minOccurs='0' maxOccurs='1'/>
   </xs:sequence>
  </xs:complexType>
 </xs:element>

 <xs:element name="name" type='xs:string'/>
 <xs:element name="street" type='xs:string'/>
</xs:schema>
SCHEMA

bad_xml = <<-DOC
<?xml version="1.0" encoding="UTF-8"?>
<addresses xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation='test.xsd'>
  <address>
    <name>Joe Tester</name>
    <street>Baker street 5</street>
    <wrongExtraField/>
  </wrongClosingTag>
</addresses>
DOC

good_xml = <<-DOC
<?xml version="1.0" encoding="UTF-8"?>
<addresses xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation='test.xsd'>
  <address>
    <name>Joe Tester</name>
    <street>Baker street 5</street>
  </wrongClosingTag>
</addresses>
DOC

xsd = Nokogiri::XML::Schema(schema)

puts "Validating good doc..."
xsd.validate(Nokogiri::XML(good_xml)).each do |error|
  puts error.message
end
puts

puts "Validating bad doc..."
xsd.validate(Nokogiri::XML(bad_xml)).each do |error|
  puts error.message
end
puts

puts "Validating good doc..."
xsd.validate(Nokogiri::XML(good_xml)).each do |error|
  puts error.message
end
puts

jruby_output.md

$ ruby example.rb
Ruby: jruby 1.7.19 (1.9.3p551) 2015-01-29 20786bd on Java HotSpot(TM) 64-Bit Server VM 1.8.0_45-b14 [darwin-x86_64]
Nokogiri: 1.6.6.2

Validating good doc...

Validating bad doc...
cvc-complex-type.2.4.d: Invalid content was found starting with element 'wrongExtraField'. No child element is expected at this point.

Validating good doc...
cvc-complex-type.2.4.d: Invalid content was found starting with element 'wrongExtraField'. No child element is expected at this point.
# ^^^^^^--- This is unexpected to me!

mri_output.md

$ ruby example.rb
Ruby: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Nokogiri: 1.6.6.2

Validating good doc...

Validating bad doc...
Element 'wrongExtraField': This element is not expected.

Validating good doc...
# ^^^^^^--- This is what I expected