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This files describes API changes in /dataformat/ download system,
information provided here is intended especially for developers.
=== 3.9 ===
* The following methods have been added to the base dataformat class to allow instances to export to a local
file. They can be overridden in extending classes to define how files should be created:
- start_output_to_file()
- close_output_to_file()
* Calls to the following dataformat plugin methods have been removed:
- write_header()
- write_footer()
* The following methods have been added to the base class to allow instances to define support for exporting
HTML content, with additional support for defining how images should be embedded:
- supports_html()
- export_html_image_source()
* Dataformat writers should also call the following method to ensure data is properly formatted before being
written, which takes into account prior methods defining support for HTML:
- format_record()
=== 3.4 ===
* In order to allow multiple sheets in an exported file the functions write_header() and write_footer() have
been removed from core dataformat plugins and have been replaced.
- write_header() has been replaced with the two functions start_output() and start_sheet().
- write_footer() has been replaced with the two functions close_output() and close_sheet().
For backwards compatibility write_header() and write_footer() will continue to work but if used will
trigger the function error_log().
=== 3.1 ===
* Added new plugin system with low memory support for csv, ods, xls and json