FTP service update to improve access to text mining collections

PMC has reorganized its FTP Service site for users interested in accessing the PMC Article Datasets, which include the original Open Access (OA) Subset. New top-level FTP directories help users quickly locate the content available for bulk download that best suits their research needs. These directories include: oa_package - article packages for individual OA articles oa_pdf - individual PDFs for OA articles oa_bulk - bulk packages of text from OA articles manuscript - author manuscripts collected under a funding agency's public access policy historical_ocr - select OCR texts from the PMC Back Issue Digitization project To make it easier for users to identify and comply with the different licenses that apply to OA articles, new file lists have been created and the file lists for individual OA articles now include a "license-type" field for each article. Similarly, the bulk packages of OA article text have been divided into two sets. One set comprises articles that may be used for commercial purposes (the Commercial Use Collection); the other contains articles that can be used only for non-commercial purposes. See the Open Access Subset page for details. To allow regular users to transition to the new arrangement, the previous arrangement of files and directories will be maintained in parallel for at least four weeks (i.e., until the end of August 2016).