module ActiveFedora::Core

def initialize(attributes = nil, &_block)

the given namespace.
+:namespace+ value to Fedora::Repository.nextid to generate the next id available within
Also, if +attrs+ does not contain +:id+ but does contain +:namespace+ it will pass the
next available Fedora id, and mark as new object.
Constructor. You may supply a custom +:id+, or we call the Fedora Rest API for the 
def initialize(attributes = nil, &_block)
  init_internals
  attributes = attributes.dup if attributes # can't dup nil in Ruby 2.3
  id = attributes && (attributes.delete(:id) || attributes.delete('id'))
  @ldp_source = build_ldp_resource(id)
  raise IllegalOperation, "Attempting to recreate existing ldp_source: `#{ldp_source.subject}'" unless ldp_source.new?
  assign_attributes(attributes) if attributes
  assert_content_model
  load_attached_files
  yield self if block_given?
  _run_initialize_callbacks
end