ODL (NASA Object Description Language)
ODL (Object Description Language) is a generic structured data format developed by NASA. It is used by PDS (through version 3), and possibly other formats.
Other formats exist with a similar or identical name. NASA ODL is not related to Microsoft ODL.
ODL files are plain text, with most lines in "keyword = value" format. Most files have sections delimited by "OBJECT" and "END_OBJECT", and/or sections delimited by "GROUP" and "END_GROUP".
- PDS Standards Reference, Chapter 12: ODL Specification and Usage