Unverified50% confidenceFactExact time
A PDF is organized by the COS object model (Carousel Object Structure), containing indirect objects, cross-reference tables, a document catalog, a page tree, content streams, and resource dictionaries; a 'layer' is not a first-class concept in the PDF specification, but is simulated through optional content groups (OCGs), separate XObjects, or stacking multiple content streams.
1
Sources
50%
Confidence
Long-term
Relevance
10/13/2026
First Seen
Sources
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