import org.apache.commons.logging.LogFactory;
import org.argeo.slc.execution.ExecutionSpec;
import org.argeo.slc.execution.ExecutionSpecAttribute;
+import org.argeo.slc.execution.RefSpecAttribute;
+import org.argeo.slc.execution.RefValueChoice;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;