> I was also misinformed for quite some time about the internal format of PDF, assuming it was just PS wrapped up in a container. In a sense, this is true, but

> I was also misinformed for quite some time about the internal format of PDF, assuming it was just PS wrapped up in a container. In a sense, this is true, but there's a lot more (embedded fonts, transparency, forms are just a few that come to mind). There's also a lot less, as PDF is not a full programming language like PS.