ParsedDocument getOwnerDoc() {
        verifyThat(ownedBy != null, "not owned by any document");
        return ownedBy;
    }
This class holds the extracted information after parsing a "struct"
block, using simple data structures as far as possible.  Do not put
advanced logic here!
@author arnej27959
config-model/src/main/java/com/yahoo/schema/parser/ParsedStruct.java