def getMetadata(self, objectId=None, **filters):
""" Request metadata about a text or a collection
:param textId: Object Identifier to filter on
:type textId: str
:param filters: Kwargs parameters.
:type filters: dict
:return: Collection
"""
if objectId is not None:
filters["urn"] = objectId
ti = TextInventory()
ti.parse(self.endpoint.getCapabilities(**filters))
if objectId:
return [x for x in [ti] + ti.descendants if x.id == objectId][0]
return ti
