关于 model.getMapping

sandgia

假设 path_ontology = "/ERP/BID/Bid/ontology"下面有个 concept = "TABLEA" 的概念， 映射的数据库表为 "TABLEA"
Model model = com.justep.model.ModelUtils.getModel(path_ontology);
Concept useableConcept = model.getUseableConcept(concept);

Mapping mapping = model.getMapping(concept);//返回null
LinkedHashMap<String, MappingTable> mappingTables = mapping.getMappingTables();

为什么上面代码中  model.getMapping(concept); 返回的是null，传入的参数不对吗？