pkl->add_child("Id")->add_child_text ("urn:uuid:" + pkl_uuid);
pkl->add_child("AnnotationText")->add_child_text (metadata.annotation_text);
pkl->add_child("IssueDate")->add_child_text (metadata.issue_date);
pkl->add_child("Id")->add_child_text ("urn:uuid:" + pkl_uuid);
pkl->add_child("AnnotationText")->add_child_text (metadata.annotation_text);
pkl->add_child("IssueDate")->add_child_text (metadata.issue_date);