Crossing restriction question

[M-crit]

You've received instructions to descend via the "ABC" arrival. The arrival says to cross "XYZ" intersection at 250 kts and 15,000 ft. 15 miles before the fix ATC says "descend and maintain 10,000." Does this mean you can negate the altitude and speed at the crossing restriction? Or just the altitude? Please include reference sources if possible.

Thanks to all for making this one of the most thread-jacked and confusing responses I could have hoped for. The number of responses that say things such as "I feel," "I assume," or "I think" frightens me.

 

[sweptback]

It's sad that we all call ourselves professional aviators, yet don't know the answers to basic aviation questions.

 

[Speedtape]

It's sad that we all call ourselves professional aviators, yet don't know the answers to basic aviation questions.

We??????

 

[sweptback]

We??????

I was generalizing. Some of us.

 

[Poahi]

It's sad that we all call ourselves professional aviators, yet don't know the answers to basic aviation questions.

To add to that ~~
What's really sad is that some expect ATC to train us.

 

[rtmcfi]

It's sad that we all call ourselves professional aviators, yet don't know the answers to basic aviation questions.

I find it sad that our government does such a poor job diseminating info, and enforcing standards, that threads like these always pop up.