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add OCG hint
PDF has a concept of layers that you can enable and disable (at least in a few viewers). The official name is “optional content groups” (OCG). This has nothing to do with ConTeXt’s [[Layers]].
There’s no other documentation yet, maybe have a look into the sources {{src|attr-lay.mkiv}}, {{src|attr-lay.lua}} and {{src|lpdf-ren.lua}}. It’s also used in some presentation styles.
