@Override
        public String toString() {
            return id.toString();
        }
Grabs values out of a {@link ShapeId} or uses the shape ID directly
as a string, and when cast to a string, returns the absolute shape ID.

<p>This attribute has the following properties:

<ul>
    <li>namespace: The shape ID namespace.</li>
    <li>name: The shape ID name.</li>
    <li>member: The optionally present shape ID member.</li>
</ul>
smithy-model/src/main/java/software/amazon/smithy/model/selector/AttributeValueImpl.java