On that point of order, it doesn't really give direction on it, other than that a committee may request it. It's up to the committee when we have an issue being raised. It's in chapter 20, page 1066, of House of Commons Procedure and Practice:
The House recommends that its committees advise witnesses of their rights and duties and of the penalties to which they are liable if they refuse to respond to committees’ requests.
Any witness appearing before a committee may be required to take an oath or make a solemn affirmation. As a general rule, committees, which have full discretion in this matter, seldom require witnesses to be sworn in. A witness who refuses to be sworn in might be charged with contempt of the House. Likewise, refusal to answer questions or failure to reply truthfully may give rise to a charge of contempt of the House, whether the witness has been sworn in or not.
On a point of order, Mr. Alexander.