<featurePropertymaxOccurs="1"target="ng2_AbstractLayeredConstructionType"path="layeredConstruction"schema="ng2"relationType="association"><!-- could be "aggregation" -->
<featurePropertymaxOccurs="1"target="ng3_AbstractLayeredConstructionType"path="layeredConstruction"schema="ng3"relationType="association"><!-- could be "aggregation" -->