public String getExternalId() {
        return this.externalId;
    }
<p>
The external ID of a composite model on this asset model. For more information, see <a
href="https://docs.aws.amazon.com/iot-sitewise/latest/userguide/object-ids.html#external-ids">Using external
IDs</a> in the <i>IoT SiteWise User Guide</i>.
</p>

@return The external ID of a composite model on this asset model. For more information, see <a
        href="https://docs.aws.amazon.com/iot-sitewise/latest/userguide/object-ids.html#external-ids">Using
        external IDs</a> in the <i>IoT SiteWise User Guide</i>.
aws-java-sdk-iotsitewise/src/main/java/com/amazonaws/services/iotsitewise/model/AssetModelCompositeModelSummary.java