public Boolean isFlatten() {
        return this.flatten;
    }
<p>
A query parameter of a Boolean value to resolve (<code>true</code>) all external model references and returns a
flattened model schema or not (<code>false</code>) The default is <code>false</code>.
</p>

@return A query parameter of a Boolean value to resolve (<code>true</code>) all external model references and
        returns a flattened model schema or not (<code>false</code>) The default is <code>false</code>.
aws-java-sdk-api-gateway/src/main/java/com/amazonaws/services/apigateway/model/GetModelRequest.java