Return the implicit data value quality. For efficiency, a single (implicit) quality value is represented for
all data values along with any quality values not equal to the implicit quality. For example, for a set
of data samples all with good quality only the implicit quality is represented.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2