'Simple placeholder for yet-to-be-fetched data
:param modulestore: the pymongo db connection with the definitions
:param definition_locator: the id of the record in the above to fetch'

def __init__(self, modulestore, course_key, block_type, definition_id, field_converter):

    self.modulestore = modulestore
    self.course_key = course_key
    self.definition_locator = DefinitionLocator(block_type, definition_id)
    self.field_converter = field_converter
