public String getExpectedRevisionId() {
        return this.expectedRevisionId;
    }
<p>
The identifier of the revision of the policy to edit. If this revision ID doesn't match the current revision ID,
Amazon Lex throws an exception.
</p>
<p>
If you don't specify a revision, Amazon Lex overwrites the contents of the policy with the new values.
</p>

@return The identifier of the revision of the policy to edit. If this revision ID doesn't match the current
        revision ID, Amazon Lex throws an exception.</p>
        <p>
        If you don't specify a revision, Amazon Lex overwrites the contents of the policy with the new values.
aws-java-sdk-lexmodelsv2/src/main/java/com/amazonaws/services/lexmodelsv2/model/CreateResourcePolicyStatementRequest.java