OpenDb Export documentation
---------------------------

There are several standard functions that must be included in
each export plugin:

	get_file_content_type()
	get_file_extension()
	get_display_name()
	get_plugin_type()
		Return 'row' or 'item'

	file_header($title)	[OPTIONAL]
	file_footer()		[OPTIONAL]
	
	http_header($filename, $content_type)		[OPTIONAL]
		If this method exists, it is assumed that it will provide
		the required header(...) calls to stream the headers out to
		the browser.
		
		You can also implement a dummy version of this function if you
		want to dump the whole content as part of the close() method.
	
Depending on the plugin_type, there are extra methods required.

Row based
---------

	prompt_header($columns)	[OPTIONAL]
	data_header($columns)	[OPTIONAL]
	item_row($columns)
	close()					[OPTIONAL]
	
Item based
----------

	start_item($item_id, $s_item_type, $title, $category)
	end_item($item_id)
	item_instance($item_id, $instance_no, $owner_id, $borrow_duration, $s_status_type, $status_comment)
	item_attribute($item_id, $s_attribute_type, $order_no, $attribute_val)
	