public java.util.Map<String, MessageSystemAttributeValue> getMessageSystemAttributes() {
        if (messageSystemAttributes == null) {
            messageSystemAttributes = new com.amazonaws.internal.SdkInternalMap<String, MessageSystemAttributeValue>();
        }
        return messageSystemAttributes;
    }
<p>
The message system attribute to send. Each message system attribute consists of a <code>Name</code>,
<code>Type</code>, and <code>Value</code>.
</p>
<important>
<ul>
<li>
<p>
Currently, the only supported message system attribute is <code>AWSTraceHeader</code>. Its type must be
<code>String</code> and its value must be a correctly formatted X-Ray trace header string.
</p>
</li>
<li>
<p>
The size of a message system attribute doesn't count towards the total size of a message.
</p>
</li>
</ul>
</important>

@return The message system attribute to send. Each message system attribute consists of a <code>Name</code>,
        <code>Type</code>, and <code>Value</code>.</p> <important>
        <ul>
        <li>
        <p>
        Currently, the only supported message system attribute is <code>AWSTraceHeader</code>. Its type must be
        <code>String</code> and its value must be a correctly formatted X-Ray trace header string.
        </p>
        </li>
        <li>
        <p>
        The size of a message system attribute doesn't count towards the total size of a message.
        </p>
        </li>
        </ul>
aws-java-sdk-sqs/src/main/java/com/amazonaws/services/sqs/model/SendMessageRequest.java