Does ipad support all PDF formats?

There are 6 editions and roughly 11 different flavors of PDF formats that respective IPAD readers could potentially be using and I just wanted to make sure that IPAD is already supporting them all.  Does anyone know what flavor of PDF
iAnnotate
GoodReader
is using?

I'm fairly confident that the iPad doesn't support them all. It supports the most common variants, certainly. Adobe is pretty much always in the process of constructing a new variant of PDF to keep the open-source crowd at bay.
It isn't quite accurate to talk of "iPad" PDF support either. The iPad supports only what iPad apps support. If they wanted to, Adobe could write their own iPad app that supported all PDF variants. The iPad may even have better PDF support than MacOS X. There is a GeoPDF app for the iPad, but not for MacOS X.
May I ask why you ask?

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