public String getLabelNamespace() {
        return this.labelNamespace;
    }
<p>
The label namespace prefix for this rule group. All labels added by rules in this rule group have this prefix.
</p>
<ul>
<li>
<p>
The syntax for the label namespace prefix for your rule groups is the following:
</p>
<p>
<code>awswaf:&lt;account ID&gt;:rulegroup:&lt;rule group name&gt;:</code>
</p>
</li>
<li>
<p>
When a rule with a label matches a web request, WAF adds the fully qualified label to the request. A fully
qualified label is made up of the label namespace from the rule group or web ACL where the rule is defined and
the label from the rule, separated by a colon:
</p>
<p>
<code>&lt;label namespace&gt;:&lt;label from rule&gt;</code>
</p>
</li>
</ul>

@return The label namespace prefix for this rule group. All labels added by rules in this rule group have this
        prefix. </p>
        <ul>
        <li>
        <p>
        The syntax for the label namespace prefix for your rule groups is the following:
        </p>
        <p>
        <code>awswaf:&lt;account ID&gt;:rulegroup:&lt;rule group name&gt;:</code>
        </p>
        </li>
        <li>
        <p>
        When a rule with a label matches a web request, WAF adds the fully qualified label to the request. A
        fully qualified label is made up of the label namespace from the rule group or web ACL where the rule is
        defined and the label from the rule, separated by a colon:
        </p>
        <p>
        <code>&lt;label namespace&gt;:&lt;label from rule&gt;</code>
        </p>
        </li>
aws-java-sdk-wafv2/src/main/java/com/amazonaws/services/wafv2/model/RuleGroup.java