public String getSignature() {
        return this.signature;
    }
<p>
A unique identifier for the built-in slot type. To find the signature for a slot type, see <a href=
"https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/built-in-intent-ref/slot-type-reference"
>Slot Type Reference</a> in the <i>Alexa Skills Kit</i>.
</p>

@return A unique identifier for the built-in slot type. To find the signature for a slot type, see <a href=
        "https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/built-in-intent-ref/slot-type-reference"
        >Slot Type Reference</a> in the <i>Alexa Skills Kit</i>.
aws-java-sdk-lexmodelbuilding/src/main/java/com/amazonaws/services/lexmodelbuilding/model/BuiltinSlotTypeMetadata.java