resource.create() hook

		For PCDM File

def _post_create(self, auto_refresh=False):

		'''
		resource.create() hook

		For PCDM File
		'''

		# set PCDM triple as Collection
		self.add_triple(self.rdf.prefixes.rdf.type, self.rdf.prefixes.pcdm.File)
		self.update(auto_refresh=auto_refresh)