public String toPointer(ToShapeId id) {
        return refStrategy.toPointer(id.toShapeId());
    }
Given a shape ID, returns the value used in a $ref to refer to it.

<p>The return value is expected to be a JSON pointer.

@param id Shape ID to convert to a $ref string.
@return Returns the $ref string (e.g., "#/responses/MyShape").
smithy-jsonschema/src/main/java/software/amazon/smithy/jsonschema/JsonSchemaConverter.java