Is it possible and legal to have a custom property with no value?

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it convenient application able create custom attribute no value (nil, empty).

is possible? legal? (according pdf specs)

experiments acrobat pro didn't produce encouraging results. when tried in "document properties|custom" dialog, "add" button disabled long value box empty.

i still hopeful because custom properties created programmatically.

tia,

-rfh

sure - can have key in info dictionary value nil...however, according iso 32000-1, that's if doesn't exist.

perhaps should looking @ putting information elsewhere anyway. trying accomplish?


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