PDS4 Bundle with the Mars Exploration Rover (Spirit and Opportunity) Alpha
Particle Xray Spectrometer (APXS) Derived Oxide Data

This bundle contains MER (Spirit and Opportunity) APXS oxide data migrated
from the PDS3 volume.

The bundle contains the following collections:

- Oxide data collection located in the data directory.
- Document collection located in the document directory.
- Miscellaneous collection located in the index directory.

Each product in this bundle is described by a PDS4 label in a separate file
with the same name as the file described by the label but with the extension
XML. PDS4 labels are XML (eXtended Markup Language) files that conform to the
PDS4 Information Model XML schema at
https://pds.nasa.gov/pds4/schema/released/. The PDS4 labels are best viewed
in an XML-aware text editor, and may be used by software that can manipulate
XML documents.

Note that the PDS4 labels and other products are merged with the PDS3 volume
such that all the PDS3 files and directories are preserved. But not all of
the PDS3 files have PDS4 labels. For example, the files in the catalog and
software directories, along with a few ancillary PDS3 files were not made
into PDS4 products. Thus, users who want access to the PDS3 labels can
continue to use them. Also, most of the MER documentation is archived in a
separate PDS4 document bundle. Therefore, most documents in this bundle are
listed as secondary members in the document collection. See the document
bundle (urn:nasa:pds:mer_documentation) for the most up to date versions of
MER documents.

The Spirit and Opportunity Rovers are also known as MER2 and MER1 (spacecraft
serial numbers) and MERA and MERB, respectively.

This bundle was created and archived by the Geosciences Node of the Planetary
Data System. Questions about this bundle may be directed to
geosci@wunder.wustl.edu.