Punctuation in Meta Content tag?

Is the question mark below allowable…

<meta name="description"
	content="Did your plans change?  Learn about our Cancellation Policy.">


I can’t find anything that says a question mark isn’t legitimate.

No reason why not - any characters within the charset you’ve defined can be used, and character entities should be used for any others (including &quot; if you need it).

META in HTML 4.01

content CDATA #REQUIRED – associated information –

CDATA in HTML 4.01

CDATA is a sequence of characters from the document character set and may include character entities. User agents should interpret attribute values as follows:
Replace character entities with characters,
Ignore line feeds,
Replace each carriage return or tab with a single space.

CDATA is the same as normal content text in html – so anything you can use on your content you can put into your CONTENT attribute.