igpp.docgen is a Java tool designed to generate documents based upon an Apache Velocity template. PPI has used igpp.docgen () to generate these PDS4 labels. Meeting these requirements will allow CDF files to be described by using PDS4 (XML) labels. Tools to verify CDF-A and ISTP/IACG compliance are available from PDS/PPI and SPDF, respectively. Furthermore, the CDF metadata should comply with the ISTP/IACG (International Solar-Terrestrial Physics Science Initiative/Inter-Agency Consultative Group for Space Sciences) guidelines () published by NASA's Space Physics Data Facility (SPDF). First, CDF files should be prepared according to the CDF-A Specification (available at: ), which includes requirements on the CDF data structure which allow the data to be described using PDS metadata. This experience has led to a set of well-defined processes and tools by which data in NASA's Common Data Format (CDF) may be prepared for inclusion in the PDS archive. The Planetary Plasma Interactions (PPI) node of NASA's Planetary Data System (PDS) has over a year's worth of experience in archiving data from the MAVEN mission in PDS (using PDS4, PDS' new, XML-based metadata standard), and is currently developing PDS4 archive products for the ARTEMIS and Cassini missions as well.
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