Get all editions of the texts

        :return: List of editions
        :rtype: [CtsTextMetadata]

def editions(self):
        """ Get all editions of the texts

        :return: List of editions
        :rtype: [CtsTextMetadata]
        """
        return [
                item
                for urn, item in self.parent.children.items()
                if isinstance(item, CtsEditionMetadata)
            ]