Exact chapter in ISO 15930-1:2001 (PDF/X-1a)

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hi,

 

silly question perhaps, part of iso 15930-1:2001 (pdf/x-1a) precisely tells me new pdf-features live transparency (pdf 1.4), optional content (pdf1.5) not allowed. not doubt prohibited. need pinpoint exact chapter / paragraph in pdf/x-1a spec telling me that.

 

thanks

15930-1:2001 based on pdf 1.3, therefore knows nothing features found in later versions of pdf , such can't explicitly declare them unsupported.   pure standards read, having transparency (for example) in pdf/x-1a:2001 document not illegal - standard implementations of validators flag such things.

 

however, 2003 update standard explicitly prohibit transparency.



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