Request metadata about a text or a collection

        :param objectId: Object Identifier to filter on
        :type objectId: str
        :param filters: Kwargs parameters.
        :type filters: dict
        :return: Collection

def getMetadata(self, objectId=None, **filters):
        """ Request metadata about a text or a collection

        :param objectId: Object Identifier to filter on
        :type objectId: str
        :param filters: Kwargs parameters.
        :type filters: dict
        :return: Collection
        """
        if objectId is None:
            return self.inventory
        elif objectId in self.inventory.children.keys():
            return self.inventory[objectId]
        texts, _, _ = self.__getTextMetadata__(urn=objectId)

        # We store inventory names and if there is only one we recreate the inventory
        inv_names = [text.parent.parent.parent.id for text in texts]
        if len(set(inv_names)) == 1:
            inventory = self.classes["inventory"](name=inv_names[0])
        else:
            inventory = self.classes["inventory"]()

        # For each text we found using the filter
        for text in texts:
            tg_urn = str(text.parent.parent.urn)
            wk_urn = str(text.parent.urn)
            txt_urn = str(text.urn)
            # If we need to generate a textgroup object
            if tg_urn not in inventory.textgroups:
                self.classes["textgroup"](urn=tg_urn, parent=inventory)
            # If we need to generate a work object
            if wk_urn not in inventory.textgroups[tg_urn].works:
                self.classes["work"](urn=wk_urn, parent=inventory.textgroups[tg_urn])

            if isinstance(text, CtsEditionMetadata):
                x = self.classes["edition"](urn=txt_urn, parent=inventory.textgroups[tg_urn].works[wk_urn])
                x.citation = text.citation
            elif isinstance(text, CtsTranslationMetadata):
                x = self.classes["translation"](urn=txt_urn, parent=inventory.textgroups[tg_urn].works[wk_urn], lang=text.lang)
                x.citation = text.citation
            elif isinstance(text, CtsCommentaryMetadata):
                x = self.classes["commentary"](urn=txt_urn, parent=inventory.textgroups[tg_urn].works[wk_urn], lang=text.lang)
                x.citation = text.citation

        return inventory[objectId]