But do keep in mind that it's more than possible to see different validation results between checking an epub with standalone FlightCrew and opening the epub in Sigil and then running the validation. This is because when you open the epub in Sigil, it will perform some normalization of the XHTML source (HTML Tidy, with or without the "clean" option depending on your Tidy setting in the Sigil toolbar).
So while the validation engine is the same, when you open the epub in Sigil, the validation engine could see something slightly different from what it would have seen had you just tried to validate the epub with standalone FlightCrew (since the FC clients don't perform any normalization, they look at the epub "read-only").
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