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.. include:: /Includes.rst.txt
.. _introduction:
============
Introduction
============
The system extension "Import/Export" (EXT:impexp) allows content to be exported
from one installation of TYPO3 and then imported into another. Exported data
includes content from multiple tables including :sql:`tt_content` as well as
images and other files stored in :file:`fileadmin/`.
This extension is often used to manage content for :ref:`distributions<t3coreapi:distribution>`
and also training and demonstration purposes.
.. _merging_multiple_sets_of_data:
Merging multiple sets of data
=============================
By default the identifiers are changed when importing data, making it possible to
merge several projects into one installation. The table identifiers are
automatically changed in such a way that content elements remain attached to
their pages and images to their content elements.
It is also possible to keep the identifiers (`uids`) to allow the reproduction
of the exact same page and content tree.
.. _what-doesnt-it-do:
What doesn't it do?
===================
* Exported content does not include code from any installed extensions or
sitepackages.
* This extension is not used for the :guilabel:`Download`
feature in the :guilabel:`List` module.
.. _backward_compatibility:
Backward compatibility
======================
The data structure for content exports have seen very little changes since their
original inception. It is sometimes possible to export content from a fifteen
year old TYPO3 installation straight into a current installation of TYPO3.
It is often more feasible to use the import/export tool
than it is to attempt to update old installations of TYPO3.
The following images show the export dialog of a current TYPO3 installation and
TYPO3 v3.8.0: They correspond pretty much.
.. include:: /Images/AutomaticScreenshots/ImpExp.rst.txt
.. include:: /Images/ManualScreenshots/ImpExpV3.8.rst.txt