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Represents the "P" entry of the user properties attributes
object.
It is a required entry defined as part of the PDF 1.0
specification.
It contains an array which contains UserPropertyElements.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 328,
page 569.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 361, page 736.
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