This function returns the name of the property, if an aspect uses IDs for its elements. As example, the aspect NodesAspect has the property id that represents the IDs of the aspect.
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an object of one of the aspect classes (e.g. NodesAspect, EdgesAspect, etc.)
By default aspects don't have IDs, so only the implemented classes have IDs. Aspects with IDs will be considered in the meta-data aspect to determine properties like: idCounter and elementCount.
Uses method dispatch, so the default return is NULL and only aspect classes with IDs are implemented. This way it is easier to extend the data model.
character; Name of the ID property or NULL
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