Used to determine whether or not the fields comprise a mosaic or map setup. When used with single pointings then the pointings form a customised mosaic if this boolean is true. Otherwise they are separate, individual, single fields.
When used with a single rectangle definition this boolean may be ignored, as the rectangle is by definition a "mosaic". However, it may be best to set to true to avoid any doubt.
When ised with multiple rectangle definitions its purpose is as yet undefined. (And this concept is not yet supported). Again for now it may be best to set it to true, but future use case of this scenario may change this.

General Info
Name	isMosaic
Type	Boolean
Visibility	private
Default Value	0
Owner	TargetParameters
Multiplicity	0..1
Is Read Only	false
Is Static	false
Aggregation	none
Is Derived	false