fop 2.3

## Uses of Class
org.apache.fop.pdf.PDFNull

Packages that use PDFNull
org.apache.fop.pdf: Classes for handling the low-level creation of PDF documents.

Uses of PDFNull in org.apache.fop.pdf

Fields in org.apache.fop.pdf declared as PDFNull
`static PDFNull` `PDFNull.INSTANCE` Instance for the "null" object.

fop 2.3

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