(4)The XML format templates should be used to provide data to the relevant entities in a manner which facilitates its aggregation, while the XML messages should be used to streamline the data-exchange process between the trade repositories and the relevant entities. Delegated Regulation (EU) No 151/2013 does not exclude the additional separate use of non-XML format templates, such as comma separated values (csv) or text (txt) files, to the extent that they allow the relevant entities to fulfil their responsibilities and mandates. Trade repositories should therefore be permitted to continue to use those formats in addition to, but never as a substitute for, the use of the XML format templates. At a minimum, XML format templates and XML messages based on the ISO 20022 methodology should be used for all output reports and exchanges to ensure comparability and aggregation of data across trade repositories.