PDS 3 Information Model Specification Status Report Specification

PDS 3 Information Model Specification Status Report Specification Working Group April 3, 2008 PDS 3 Specification Report, 4/3/08

Overview • Describe the document • Brief update of progress to date • Discuss the next step • Projected deliverables • Conclusions 2 PDS 3 Specification Report, 4/3/08

The Document • Intended for use by programmers and data engineers • Provides an objective, internally consistent, and detailed description of PDS 3 as it is currently used • Ignoring implementation issues 3 PDS 3 Specification Report, 4/3/08

A Simple Example: A Table Product Table + Label Data Product 4 PDS 3 Specification Report, 4/3/08

Engineering Model –Table Product • Data Object: (Sequence of bits) 101001101001101 … • Tag, the information to read bits: INTERCHANGE FORMAT, ROWS, … • Pointer • Identification Elements: DATASET_ID, INSTRUMENT_ID, … • Descriptive Elements: FILTER_NAME, … 5 PDS 3 Specification Report, 4/3/08

Progress Update • We’re on about version 12 of the document • We’ve concentrated on the introductory sections – Especially key vocabulary, structure, and logical context • Also done a fair amount of work on the supplemental sections – Data Dictionary, Glossary, Anomalies 6 PDS 3 Specification Report, 4/3/08

What’s Next • Detailed review of actual specification – Had an early, limited review by entire tech group. – Need a detailed, item by item review. • Explicit requirements are documented correctly • Associations are accurate and complete – Estimate will need ~ 2 man-months 7 PDS 3 Specification Report, 4/3/08

Deliverables • Specification Document • Issues & Anomalies Summary • Non-technical Executive Summary 8 PDS 3 Specification Report, 4/3/08

Conclusions • Working Group Assessment – This is worth doing. – Document is not yet complete or accurate. – It will provide an essential foundation for PDS 2010+ • We need a few extra people for the detailed review of the specification • Questions? 9 PDS 3 Specification Report, 4/3/08