id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
iassist-126	Amin, Alerk; Barkow, Ingo; Kramer, Stefan; Schiller, David; Williams, Jeremy	Design Considerations for DDI-Based Data Systems	2016	6	.pdf	application/pdf	4760	212	49	In a DDI structure based on XML files, this is difficult to represent; and it is difficult in an XML database, as the structure is largely based on the original DDI XML schema, which normally (as it is file-based) demands a separate XML file for each survey. If DDI XML is also the output format, which is likely, then the mapping would have to occur again, this time from the relational structure to DDI XML.	cache/iassist-126.pdf	txt/iassist-126.txt