Thanx everyone! I did eventually go to this site:
Hand Rankings although I don't know how "official" it is.
Here is an excerpt:
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Although true wild cards are rarely seen in a casino, they are a popular way to add excitement to a home game. They are treated as whatever card the player chooses them to be, even if that card is already held by the player. Wild cards allow more Five of a Kind hands than the joker. They can also cause confusion when two players hold the same hand composed of different wild card combinations. The standard rules of poker do not distinguish between such hands, but some players prefer to rank hands using fewer wild cards above less "natural" versions of the same hand.
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