The SCHEMA_PREFIX_TABLE structure defines the concrete type for a table to map ATTRTYP values to and from OIDs.

 typedef struct {
   [range(0,1048576)] DWORD PrefixCount;
   [size_is(PrefixCount)] PrefixTableEntry* pPrefixEntry;
 } SCHEMA_PREFIX_TABLE;

PrefixCount: The number of items in the pPrefixEntry array.

pPrefixEntry: An array of PrefixTableEntry items in the table.