module JsonSchema::Attributes

def self.included(klass) 

def self.included(klass)
  klass.extend(ClassMethods)
  klass.send(:initialize_attrs)
end

def [](name)

reference on an sintance of this class (as well as plain JSON data).
This is implemented so that `JsonPointer::Evaluator` can evaluate a

class are not available (e.g. `expanded`.)
that are part of the JSON schema specification; other methods on the
procured with `schema[:additionalItems]`. This only works for attributes
string. So for example, the value of `schema.additional_items` could be
Allows the values of schema attributes to be accessed with a symbol or a 
def [](name)
  name = name.to_sym
  if self.class.schema_attrs.key?(name)
    send(self.class.schema_attrs[name])
  else
    raise NoMethodError, "Schema does not respond to ##{name}"
  end
end

def copy_from(schema) 

def copy_from(schema)
  self.class.copyable_attrs.each do |copyable, _|
    instance_variable_set(copyable, schema.instance_variable_get(copyable))
  end
end

def initialize_attrs 

def initialize_attrs
  self.class.copyable_attrs.each do |attr, _|
    instance_variable_set(attr, nil)
  end
end