NoMethodError: undefined method `to_class_builder' for "xsd:anyType":String

[dmolesUC]

I get the error above under Ruby 1.9.3-p551 when I try to follow the README example with the ResourceSync schema. My script:

#! /usr/bin/env ruby
require 'rxsd'
xsd_uri = 'http://www.openarchives.org/rs/0.9.1/resourcesync.xsd'
schema = RXSD::Parser.parse_xsd :uri => xsd_uri
classes = schema.to :ruby_classes

Result:

/Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/restriction.rb:110:in `to_class_builder': undefined method `to_class_builder' for "xsd:anyType":String (NoMethodError)
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/complex_content.rb:67:in `to_class_builder'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/complex_type.rb:83:in `to_class_builder'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/element.rb:135:in `to_class_builder'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/schema.rb:105:in `block in to_class_builders'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/schema.rb:104:in `each'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/xsd/schema.rb:104:in `to_class_builders'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/translator.rb:44:in `all_class_builders'
    from /Users/dmoles/.rvm/gems/ruby-1.9.3-p551/gems/rxsd-0.5.2/lib/rxsd/translator.rb:54:in `to'
    from ./schema.rb:9:in `<main>'

Possibly related to #6?