-public interface ListStatement extends DataDefinitionStatement, MultipleElementsGroup,
- DataDefinitionContainer.WithReusableDefinitions {
-
- Collection<? extends MustStatement> getMusts();
-
- @Nullable KeyStatement getKey();
-
- Collection<? extends UniqueStatement> getUnique();
-
- @Nullable ConfigStatement getConfig();
+public interface ListStatement extends MultipleElementsDeclaredStatement,
+ DataDefinitionAwareDeclaredStatement.WithReusableDefinitions<QName>,
+ ConfigStatementAwareDeclaredStatement<QName>, ActionStatementAwareDeclaredStatement<QName>,
+ MustStatementAwareDeclaredStatement<QName>, NotificationStatementAwareDeclaredStatement<QName> {
+ default @Nullable KeyStatement getKey() {
+ final Optional<KeyStatement> opt = findFirstDeclaredSubstatement(KeyStatement.class);
+ return opt.isPresent() ? opt.get() : null;
+ }