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Represents the "checked" entry of the standard structure
attributes object.
It is an optional entry defined as part of the PDF 1.0
specification. It was deprecated in PDF 2.0.
It contains a string representing a PDF name object.
The PDF specification states that this item assumes a value of
"off" if no value has been provided.
This item may take one of the following valid values:.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; page 593.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 347,
page 608.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 382, page 784.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 348,
page 609.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 383, page 785.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 349,
page 610.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 384, page 785.
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