Canonical

Canonical material in the YW universe means:

• Material in the seven (soon to be eight) published novels of the Young Wizards series.
• The two novels of the Feline Wizardry sequence.
• YW short stories such as "Uptown Local".

Material in the Concordance may be considered to be "pretty much canonical" until it actually makes it into print.

It will be at least a couple of years before the canonicality of filmed / televised YW material becomes an issue. As Tom likes to say, "We'll burn that bridge when we come to it."