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Called to report the entry version.
Dictionaries are validated item by item for each of the key
value pairs.
Each key is associated with a particular PDF Version in which it
was introduced.
This function is called for each entry, with a number indicating
the minimum version required.
The PDFVersion type is a flags type enumeration so different
values can be combined together using bitwise operations. It may
take the following values:
- None - No version information available.
- PDF10 - Introduced in PDF 1.0.
- PDF11 - Introduced in PDF 1.1.
- PDF12 - Introduced in PDF 1.2.
- PDF13 - Introduced in PDF 1.3.
- PDF14 - Introduced in PDF 1.4.
- PDF15 - Introduced in PDF 1.5.
- PDF16 - Introduced in PDF 1.6.
- PDF17 - Introduced in PDF 1.7.
- PDF17Obsolescent - Obsolescent in PDF 1.7.
- AdobeUndocumented - Adobe undocumented extension.
- PDF17Extension3 - Introduced in PDF 1.7 Adobe Extension Level
3.
- PDF17Extension5 - Introduced in PDF 1.7 Adobe Extension Level
5.
- PDF20 - Introduced in PDF 2.0.
- PDF20Deprecated - Deprecated in PDF 2.0.
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