Property type that contains one diggs:PlannedPositions object inline, or refers to
one with xlink:href. Where the layout is an indexed grid rather than a general
pattern, a realized feature identifies the planned position it fulfils through
realizesGridIndex. diggs:MultiPointLocation is not an option for a grid, since it
declares no index space; a scattered or irregular layout is a degenerate
one-dimensional ReferenceableGridByArray instead.
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