cdm/src/main/java/thredds/client/catalog/builder/DatasetBuilder.java
public ThreddsMetadata getInheritableMetadata() {
    ThreddsMetadata tmi = (ThreddsMetadata) get(Dataset.ThreddsMetadataInheritable);
    if (tmi == null) {
      tmi = new ThreddsMetadata();
      put(Dataset.ThreddsMetadataInheritable, tmi);
    }
    return tmi;
  }
public ThreddsMetadata getInheritableMetadata() {
    ThreddsMetadata tmi = (ThreddsMetadata) get(Dataset.ThreddsMetadataInheritable);
    if (tmi == null) {
      tmi = new ThreddsMetadata();
      put(Dataset.ThreddsMetadataInheritable, tmi);
    }
    return tmi;
  }
get the inheritable ThreddsMetadata object. If doesnt exist, create new, empty one