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PDS 4 Information Model Issues

PDS 4 Information Model Issues. PDS Management Council 30 November 2011 Anne Raugh. 1. Information Model – Areas of Comment. Content Missing Details Outstanding Design Issues (Still) Contentious Design Decisions Model-to-Schema Translation Issues Additional Requests. IM - Content.

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PDS 4 Information Model Issues

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  1. PDS 4 Information Model Issues PDS Management Council 30 November 2011 Anne Raugh 1

  2. Information Model – Areas of Comment • Content • Missing Details • Outstanding Design Issues • (Still) Contentious Design Decisions • Model-to-Schema Translation Issues • Additional Requests

  3. IM - Content • Preamble classes (Observation_Area, Cross_Reference, etc.) • Variations in requirements for spacecraft data and other data in the preamble • Attribute definitions • lexical definition • required vs. optional • variations with context • figurative constants not yet accommodated • Over- and under-defined classes • Nomenclature, including things like: • Standard values for, e.g., association types • Inconsistent repetition of qualifiers in names • Functionally accurate naming: “Description” vs “comment”, e.g. • Distinctions without differences • enumerations with multiple options that are equivalent • complex type extensions that neither add nor restrict 3

  4. IM – Missing Details • Instrument type • Product characterizations (wavelength regime, result type, etc.) • Target naming and classifications • Units of attributes 4

  5. IM – Outstanding Design Issues • Local Dictionaries, node interaction, and formal modeling • Inheritance of associations by products of collections and collections of bundles • Parseable byte streams and observational data • Encoded byte streams and observational data • Units for searching • ADS Interface • NSSDC Interface 5

  6. IM – (Still) Contentious Design Issues • Bit fields • PDS “root” tag • Recursive structure in “Grouped” tables • Too many data structure/format variations 6

  7. IM – Model-to-Schema Translation Issues • Order of attributes in classes • Wrapping classes (Table_Record, e.g.) • Data type patterns • Unenforceable uniqueness constraints (title, e.g.) • Inappropriate upper limits • Lack of expected constraints (Product_Array_2D_Image is not required to contain an Array_2D_Image, e.g.) 7

  8. IM – Additional Requests • User-friendly presentation of the Information Model 8

  9. Backup 9

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