from bt2.component import _UserSourceComponent
from bt2.component import _UserFilterComponent
from bt2.component import _UserSinkComponent
+from bt2.component_descriptor import ComponentDescriptor
from bt2.error import ComponentClassType
from bt2.error import _ErrorCause
from bt2.error import _ComponentErrorCause
from bt2.py_plugin import plugin_component_class
from bt2.py_plugin import register_plugin
from bt2.query_executor import QueryExecutor
+from bt2.trace_collection_message_iterator import AutoSourceComponentSpec
from bt2.trace_collection_message_iterator import ComponentSpec
from bt2.trace_collection_message_iterator import TraceCollectionMessageIterator
from bt2.value import create_value