Need to validate all css for a page together?

Hi all,

I'm integrating the css validator into a project (the validator is
awesome btw!) & had a question I was hoping you could answer.

Is it safe to validate all the css for a page separately (i.e.
validate the inline / embedded css without the linked css being
available etc)?

To ask this another way - is there anything the validator can error
check better when all the elements of the css for a page are validated
together? It seems to me that wouldn't be the case, but I thought it
best to check before breaking out the validation of the inline /
embedded / linked css into separate operations a non-deterministic
order.

Thanks,
Jon Matthews