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PDF Element
The <PDF> element specifies the version of the PDF file.
The <PDF> element has no child elements.
The <PDF> element has one attribute, level = 1.3 | 1.4 | 1.5 | 1.6. The default is 1.4. PDF versions 1.3, 1.4, 1.5, 1.6, and 1.7 are supported by Adobe Acrobat 4.0, 5.0, 6.0, 7.0, and 8.0 respectively.