A node for a metadata property value. This class does not store the property value directly. Instead, is stores a reference to the metadata object that contains the property values, together with the index for fetching the value in that object. That way, the real storage objects still the metadata object, which allow {@link TreeTableView} to be a dynamic view.
Instances of this class shall be instantiated only for metadata singletons. If a metadata property is a collection, then the {@link CollectionElement} subclass shall be instantiatedinstead.
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