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 This dependency graph node takes the place of any transform node
 (ie. a Dag object that some other node tries to parent to) the createNode
 cannot find in the registration table.
 It carries along all attribute info for the node so that on file write
 it can save back all the info.
 The node will never evaluate since it knows nothing about the original
 attributes and their dependencies.

Node nameParentsMFn typeCompatible function sets
unknownTransformtransform
kUnknownTransformkBase
kNamedObject
kDependencyNode
kDagNode
kTransform
kUnknownTransform

Related nodes

unknownDag, unknown