public String getPropertyId() {
        return this.propertyId;
    }
<p>
The ID of the property to use as the variable. You can use the property <code>name</code> if it's from the same
asset model. If the property has an external ID, you can specify <code>externalId:</code> followed by the
external ID. 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 ID of the property to use as the variable. You can use the property <code>name</code> if it's from
        the same asset model. If the property has an external ID, you can specify <code>externalId:</code>
        followed by the external ID. 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/VariableValue.java