The Multi dictionary contains classes that describe the composition of multidimensional data consisting of Array (and Array subclass) data objects. It provides a way to associate data objects and align the objects in general multi-dimensional structures. Modification History: 1.0.0.0 (Todd King, 2018-Sep-29): - Initial version 2.0.0.0 (J. Mafi, 2021-Feb-23): - Changed base class name from "Particle_Observation" to "Multidimensional_Data" - Changed value class names from plural to singular ("Primary_Values" to "Primary_Value", etc.) - Updated DD_Attribute, DD_Association objects to comply with PDS4 V.1.15.0.0 - Eliminated local re-definition of Local_Internal_Reference class, and local_reference_type attribute - Changed "Face_Plane" class to "Face_Axis" - changed "axis_number" to "primary_axis_number" and added "face_axis_number" attribute - Added DD_Rule to set permissible values for Local_Internal_Reference/local_reference_type in Multidimensional_Data The Aligned_Value class identifies a value which aligns element-by-element with the main (primary) data array. The aligned values array must have the same dimensions as the observation array. The Axis_Value class identifies the data object which is associated with the one of the axes of the main data array. The Face_Axis class associates one of the axes of a face data array with one of those of the main (primary) data array. The Face_Value class identifies the data object which contains parameters associated with two or more axes of the main (primary) data array. The Multidimensional_Data describes the data values which are associated with the elements along an axis or on the face of a observation data array. The Primary_Value class identifies the data object which constitutes the main data array. This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the common namespace. The index of the axis in the face array. The first axis is numbered as 1. The index of the axis in the primary array. The first axis is numbered as 1.