public String getKey() {
        return this.key;
    }
<p>
The key of the dataset contents object in an S3 bucket. Each object has a key that is a unique identifier. Each
object has exactly one key.
</p>
<p>
You can create a unique key with the following options:
</p>
<ul>
<li>
<p>
Use <code>!{iotanalytics:scheduleTime}</code> to insert the time of a scheduled SQL query run.
</p>
</li>
<li>
<p>
Use <code>!{iotanalytics:versionId}</code> to insert a unique hash that identifies a dataset content.
</p>
</li>
<li>
<p>
Use <code>!{iotanalytics:creationTime}</code> to insert the creation time of a dataset content.
</p>
</li>
</ul>
<p>
The following example creates a unique key for a CSV file:
<code>dataset/mydataset/!{iotanalytics:scheduleTime}/!{iotanalytics:versionId}.csv</code>
</p>
<note>
<p>
If you don't use <code>!{iotanalytics:versionId}</code> to specify the key, you might get duplicate keys. For
example, you might have two dataset contents with the same <code>scheduleTime</code> but different
<code>versionId</code>s. This means that one dataset content overwrites the other.
</p>
</note>

@return The key of the dataset contents object in an S3 bucket. Each object has a key that is a unique
        identifier. Each object has exactly one key.</p>
        <p>
        You can create a unique key with the following options:
        </p>
        <ul>
        <li>
        <p>
        Use <code>!{iotanalytics:scheduleTime}</code> to insert the time of a scheduled SQL query run.
        </p>
        </li>
        <li>
        <p>
        Use <code>!{iotanalytics:versionId}</code> to insert a unique hash that identifies a dataset content.
        </p>
        </li>
        <li>
        <p>
        Use <code>!{iotanalytics:creationTime}</code> to insert the creation time of a dataset content.
        </p>
        </li>
        </ul>
        <p>
        The following example creates a unique key for a CSV file:
        <code>dataset/mydataset/!{iotanalytics:scheduleTime}/!{iotanalytics:versionId}.csv</code>
        </p>
        <note>
        <p>
        If you don't use <code>!{iotanalytics:versionId}</code> to specify the key, you might get duplicate keys.
        For example, you might have two dataset contents with the same <code>scheduleTime</code> but different
        <code>versionId</code>s. This means that one dataset content overwrites the other.
        </p>
aws-java-sdk-iotanalytics/src/main/java/com/amazonaws/services/iotanalytics/model/S3DestinationConfiguration.java