One occurrence the document no longer carries, in the shape the document
node would have had. semanticId and sourceRef keep all three states the
node could serialize: a string, an explicit null for an occurrence with no
identity, and undefined for a key the document omitted.
One occurrence the document no longer carries, in the shape the document node would have had.
semanticIdandsourceRefkeep all three states the node could serialize: a string, an explicitnullfor an occurrence with no identity, andundefinedfor a key the document omitted.