liquibase-core/src/main/java/liquibase/Scope.java
public static void child(String newValueKey, Object newValue, ScopedRunner runner) throws Exception {
        Map<String, Object> scopeValues = new HashMap<String, Object>();
        scopeValues.put(newValueKey, newValue);

        child(scopeValues, runner);
    }
public static void child(String newValueKey, Object newValue, ScopedRunner runner) throws Exception {
        Map<String, Object> scopeValues = new HashMap<String, Object>();
        scopeValues.put(newValueKey, newValue);

        child(scopeValues, runner);
    }
Creates a new scope that is a child of this scope.