how to add some pdf optional content group in cairo

李杨 <[email protected]> Thu, 31 Jan 2013 12:43:39 +0800

Newsgroups	gmane.comp.lib.cairo
Message-ID	<CANtWbECVGqxKqzNrJUNsRGzFKYOwxvdNQYvXEcC0dDKPBdokJg@mail.gmail.com>

Hi, all
I now use cairolib to succesful create a pdf file with different vector
graphics , I search the cairolib and found no fucntion about the "Optional
Content Group" in pdf file, I want to create layers in pdf file.
So how to realize the optional group content basing the cairo lib? Is there
any material for reference?

thanks,
regrards,

-- 
Yang Li

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