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+# Introduction
+
+GMNS is a large specification, but a particular application is unlikely
+to need every field in every table. This is why most fields are
+optional. This document presents several use cases, showing which parts
+of GMNS are required for each use case, and which are not. Each section
+briefly describes each use case, followed by an indication of which GMNS
+tables and fields are required to support that use case.