def get_plugin(self, plugin_id):
List all object types existing in the datastore instance.
dataset/ETHPy150Open enthought/envisage/envisage/i_plugin_manager.py/IPluginManager.get_plugin--crossover with--dataset/ETHPy150Open ooici/pyon/pyon/datastore/couchdb/base_store.py/CouchDataStore.list_objects