public java.util.Map<String, String> getExpressionAttributeNames() {
        return expressionAttributeNames;
    }
<p>
One or more substitution tokens for attribute names in an expression.
</p>

@return One or more substitution tokens for attribute names in an expression.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/model/Put.java