Extracted code related to logical structure out of PDFDocumentHandler and put it in its own PDFLogicalStructureHandler class. Vastly simplified the building of the structure tree in the same time.
Fixed bug occurring when a block contains only one line of text: the generated PDF was illegal
Fixed bug in the generation of the structural parent tree: values in a number tree must be indirect references (note: other number trees in the document may still be wrongly generated)
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xmlgraphics/fop/branches/Temp_Accessibility/src/java/org/apache/fop/pdf/PDFDocument.java